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[Objective] The present paper aimed to explore the effects of Cd stress on the absorption and transport of mineral elements in rice.[Method] 29 rice varieties were selected and treated with two groups (0,0.5 mg/kg). The contents of eight mineral elements (Ca, Fe, Zn, Mg, Cu, Mn, K,Na) in the upper and lower parts of rice were measured by atomic absorption flame spectrophotometer.[Result] In the underground part, compared with control group, the effect of Cd on Fe was shown to inhibit absorption; Zn, Mg, K and Na were resistant to Cd, and Zn was more resistant than Cu, and Cd was more competitive than Mn and Mg.Its Cd resistance and competitiveness were greater than that of Ca. Zhuzhen B and Japonica 7623 showed Cd tolerance among the eight mineral elements. [Conclusion] Zhuzhen B was the only rice variety that promoted the absorption of eight mineral elements after Cd stress; Liusha 1 was the least Cd-tolerant rice variety. [ABSTRACT FROM AUTHOR]

[Objective] The present paper aimed to explore the absorption and enrichment of heavy metals cadmium( Cd) and lead( Pb) from jute in different growth stages in heavily polluted soil, and to provide reference for bioremediation of heavy metal pollution of soil and selection of vegetable jute plantation. [ Method] Four jute varieties were planted on soil heavily polluted by Cd and Pb. The contents of Cd, Pb in different growth stages ( seedling stage, flowering stage, mature stage) and different parts ( root, hemp skin, sticks, leaf ( seed) were determined by microwave-assisted digestion and inductively coupled plasma atomic emission spectrometry, the bio virus were determined at the same time. The bio concentration factor, transfer factor and accumulation in jute were analysed. [ Result The total biomass of Funong 4 at flowering stage and mature stage was 21. 53 and 26. 18 t/hm²,respectively, higher than that of the other 3 varieties. The contents of Cd and Pb in each part of the four varieties in all stage were ranked as root > leaves( seeds) > bast > sticks. With the change of growth stage the Cd content in root, bast, stickts of Guimacai2, Funong1,Funong4 and in bast, stickts of Guimacail were ranked as seedling stage> mature stage >flowering stage. The Ph content of each part in each growth stage were ranked as mature stage > flowering stage > seedling stage. The enrichment factor and transfer factor of Cd, Pb in the four varieties were less than 1. 000 at all the growth stage. The accumulation of Cd and Pb in four varieties showed ranked as mature stage> flowering stage> a seeding stage. The highest accumulations of Cd(50.160 g/hm² ) was Guimacail at the mature stage, while the highest accumulations of Pb ( 64. 025 g/hm2 ) was Funong1 at the mature stage. [ Conclusion] When four jute varieties were planted as vegetables, the heavy metal background value of the planting soil should be investigate thoroughly to ensure their food safety. The Guimacail could be popularized and applied as a soil Cd pollution remediation plant. [ABSTRACT FROM AUTHOR]

【Objective】Leaf chlorosis happened in grafted eggplant in Emeishan city in recent years, which caused considerable yield reduction. The experiment was carried out in order to investigate the reasons and corrective measure. 【Method】Effects of combining base fertilizer with spraying magnesium fertilizer on leaf on scion-root and grafted eggplant were studied. Changes in magnesium content were monitored to study the effects of such changes on leaf yellowing. 【Result】Magnesium content of different position leaves of scion-root and grafted eggplant were tested at three different fruit development stages in different fertilizer conditions. The results showed that magnesium content and change trend in leaves were completely different between scion-root eggplant and grafted eggplant. Under the same treatment conditions, magnesium content of scion-root eggplant was always significantly higher than grafted eggplant in different position leaves at different stages. The magnesium content in grafted eggplant leaves presented a tendency to drop sharply from the second fruits development stage, which was different from that in scion-root eggplant. Magnesium content of some position leaves increased in scion-root eggplant and grafted eggplant with four treatments. But all treatments couldn’t improve the leaf chlorosis. 【Conclusion】Leaf chlorosis may be caused by magnesium deficiency in grafted eggplant according to the results. We presume that the grafting affect the absorption and translocation of magnesium in eggplant and eventually give rise to the leaf chlorosis. [ABSTRACT FROM AUTHOR]

[Objective]To provide technical support for the selenium-rich production of edible cassava, natural selenium-rich varieties and high efficient exogenous selenium strengthening technology were screened out through field experiments. [Method]The natural selenium enrichment capacity of 7 cassava varieties was measured under two soil environments with background selenium values of 1. 45 mg/kg and 0. 63 mg/kg respectively. Then, different amounts of exogenous selenium were applied by spraying, root fertilization, leaf spraying+root fertilization during the tuber swelling period of cassava to study the differences in the content of root selenium and the utilization rate of exogenous selenium in cassava under different strengthening methods and amounts. [Result] Under natural conditions, the selenium content in the root tuber of 7 edible cassava varieties fluctuated between 0. 017 and 0. 109 mg/kg. The selenium content and absorption efficiency of the root tuber of NK-10 and NZ199 were higher than those of the other 5 varieties, while the transfer efficiency of the two varieties to the ground was lower than that of the other 5 varieties. The root selenium content of cassava root under the condition of exogenous selenium strengthening was all higher than that of the control, and the selenium content of the roots increased at first and then decreased as the amount of exogenous strengthening increased. The utilization rates of exogenous selenium by foliar spraying, root fertilization and leaf spraying+root fertilization were 0. 55 %-1. 62 %, 0. 16 %-0. 61 % and 0. 06 %-0. 32 %. [Conclusion]The natural selenium enrichment capacity of different cassava varieties varied greatly, among whic h NK-10 and NZ199 had strong natural selenium enrichment eapacity. Under the condition of exogenous selenium, proper amount of exogenous selenium could effectively improve the selenium content of cassava root, and the utilization rate of exogenous selenium was the highest under foliar spraying. [ABSTRACT FROM AUTHOR]

[Objective]The experimental objective was to investigate the effect of cadmium stress on root activity and mineral nutrient elements absorption of Iris lacteal. [Method] In order to explore the effect of cadmium stress on root activity and the absorption of mineral nutrient elements of Iris lacteal, a hydroponic culture experiment was carried out to examine the root activity, the absorption of cadmium and six kinds of mineral nutrient elements (Ca, Mg,Fe, Mn, Cu ,Zn) in the aerial part and root of Iris lacteal under different CdCl2 mass concentrations (0, 10,25 ,50,100,150 mg.L-1)were investigated. [Result]The root activity increased in the absence of Cd (0 mg.L-1) with the prolonging stress days, and the root activity increased first and then decreased in 10-50 mg.L-1, while it decreased between 100 and 150 mg.L-1 Cd. The content of Mg,Mn,Cu and Zn decreased significantly and Ca and Fe content increased in the aerial part, while the content of Fe, Mn,Cu and Zn increased and Ca and Mg content decreased in root with increasing cadmium stress. The translocation factors of Ca and Mg increased and then decreased with increasing cadmium stress,the translocation factors of Mn,Cu and Zn decreased when compared to control, while there was no significant influence on Fe. Under cadmium stress,for their contents in the aerial part, significant and positive correlations between the content of Cd and Fe, and Cd showed significant and negative correlations with Ca,Cu,Zn,Mg,Mn. In the roots, Cd showed positive correlations with Cu,Zn,Mg,Mn and Fe, and significant and negative correlations between the content of Ca. The Cd content in roots was 829. 39-8944. 54 mg.L-1 , while the Cd content in shoots was 200. 60 -519. 76 mg.L-1 , suggesting that cadmium is mainlyaccumulated in the root of Iris lacteal seedlings, therefore, the Iris lacteal had the ability to retain the cadmium in the root to reduce the cadmium transfer to the shoot. [Conclusion] Under low cadmium concentration treatment conditions, root activity and mineral nutrient elements absorption of Iris lacteal were less affected by cadmium. The root activity of Iris lacteal decreasedat high cadmium concentration, and it could regulate the nutrient element uptake and distribution against cadmium stress in some scope. [ABSTRACT FROM AUTHOR]

[Objective] To screen the effective chelator which can enhance the absorption of heavy metals by Bidenspilosa L., the effects of chelators[glycol-bis-(2-aminoethylether)-N. N, N’, N’-tetraacetic acid(ETGA), nitrilotriacetic acid(NTA)and ethylene diamine disuccinate(EDDS)]on the uptake and accumulation of Cd, Pb, Cu and Zn with Bidens pilosa L. were investigated. [Method]Pot experiments was conducted to evaluate the effects of application ETGA, NTA and EDDS on the uptake and transportation of heavy metals(Cd, Pb, Cu and Zn)from contaminated mining area soil with Bidenspilosa L.. [Result] The results indicated that three chelators promoted the growth of Bidens pilosa L., and the order of effects was EDDS>EGTA>NTA. Judging from the unit content of root, stem and leaf tissue, EGTA, NTA and EDDS could promote the absorption of Zn in stem, Pb in root and Cu in root, stem and leaf of Bidens pilosa L.. Judging from the total absorption and accumulation of plants, EGTA had the best effect on absorption and accumulation of Zn, EDDS had the best effect on absorption and accumulation of Pb and Cu, and the effects of three chelators on absorption of Cd were not good in Bidens pilosa L.. The accumulation and transfer coefficients of Cu in leaves and stems of Bidens pilosa L. treated with EGTA were higher than the control, indicating that EGTA could effectively promote the accumulation and transportation of Cu in Bidens pilosa L.. [Conclusion] The chelators EGTA and EDDS did not significantly affect the absorption of Cd in Bidens pilosa L., and NTA not only reduced the absorption of Cd in Bidens pilosa L. but also did not significantly increase the absorption of Zn. All three chelators significantly increased the accumulation of Zn, Pb and Cu in Bidens pilosa L. [ABSTRACT FROM AUTHOR]

【Objective】The aim of this paper was to study the effect of phosphorus( P) combined with selenium(Se) on biomass, uptake and translocation of P and Se in winter wheat seedlings.【Method】A hydroponics trial with three P level( 0. 31, 3. 1, 31 mg/L) and three Se level( 0, 0. 1, 1 mg/L) was conducted. 【Result】The results indicated that medium( P3. 1) and high( P31) P application increased the shoot biomass and decreased the root/shoot ratio; while Se application( Se0. 1 and Se1) also decreased shoot biomass and increased the root/shoot ratio; combination of P and Se improved the root growth in winter wheat. Se application( Se0. 1 and Se1) inhibited the translocation and accumulation of P in shoots, but enhanced the P uptake and accumulation in roots at high P(P31) supply rate. Under Se deficiency( Se0), P application( P3. 1 and P31) increased Se concentration and accumulation in shoots and roots as well as Se translocation coefficient;at low( Se0. 1) and high Se( Se1) supply rates, P application( P3. 1 and P31) remarkably decreased Se concentration and accumulation in winter wheat. The obverse antagonism was observed between P and Se. 【Conclusion】For the absorption and translocation of P and Se in winter wheat seedlings, there were both mutual promotion and antagonism relationship between P and Se, which was related to the P and Se supply rates. [ABSTRACT FROM AUTHOR]

[Objective]The study aimed to discuss the correlation between growth and Zn absorbed amount ol Chinese cabbage under Zn application.[Method] Jineai 3, a Chinese cabbage variety, was used to study the effects of Zn absorbed on biochar with different concentrations on yield, quality, nutrient content and Zn absorption amount of Jineai 3.[Result] (i) Applying Zn absorbed on biochar could increase the yield of Jineai 3 cultivated iu different soils.The highest yield per plant of Jineai 3 cultivated iu yellow sand soil applied with 1 (X) mg/ kg Zn absorbed on biochar, yellow clay soil applied with 300 mg/kg Zn absorbed on biochar and clay soil applied with 200 mg/kg Zn absorbed on biochar could reach 156.35, 1 15.97 and 129.67 g respectively, (ii) The quality variation of Chinese cabbage cultivated in the same soil changes with variation ol Zn absorbed on biochar application and the soluble solid, water-soluble total sugar and Vc content ol Chi- nese cabbage cultivated in yellow sand soil, yellow clay soil and clay soil applied with 1 (X) mg/kg Zn absorbed on biochar could be up to7.4 %, 6.4 % and 5.9 %, 6.49 %, 6.67 % and 6.32 %,and 511.9 mg/kg, 420.4 mg/kg and 480.5 mg/kg respectively.(iii) Applying Zn absorbed on biochar could obviously increase the nutrients content ol Chinese cabbage cultivated in different soils and the nitrogen, phos-phorus and potassium content of Chinese cabbage cultivated in yellow sand soil, yellow clay soil and clay soil applied with 100 mg/kg or 200 mg/kg Zn absorbed on biochar could reach 2.51 %, 2.63 % and 2.43 %, 0.22 %, 0.18 % and 0.18 %, and 1.77 %, 1.96 % and 1.82 % separately, (iv) There was a significant difference in Zn absorption amount of Chinese cabbage cultivated in different soils between different applica-lion amounts of Zn absorbed on biochar and the highest Zn content of Chinese cabbage cultivated in yellow sand soil, yellow clay soil and clay soil applied with 200 or 300 mg/kg Zn absorbed on biochar could be 4.78, 4.54 and 4.41 mg/kg respectively.[Conclusion] Applying 100 -200 mg/kg Zn absorbed on biochar is beneficial to the growth of Chinese cabbage cultivated in yellow sand soil, yellow clay soil and clay soil and can increase the yield, quality, nutrient content and Zn content of Chinese cabbage. [ABSTRACT FROM AUTHOR]

[Objective] The study aims to understand nutrient eontent in leaves and nutrient resorption efficiencies for grass species, six typi­cal grass species were ehosen from an arid-hot valley. [Method]The eontents of N, P, K, Ca and Mg in leaves and leaf litters and the nutri­ent resorption efficiency under the different conditions of nutrient and moisture were explored. [Result] Cymbopogon goeringii and Bolhrioch- loa pertusa eontained high nutrients in leaves overall, Schizachyrium brevifolium eontained low nutrients. Species identity was the main faetor that signifieantly affeeted nutrient eontent in leaves and leaf litters, as well as nutrient resorption efficiencies. Water and nutrient treatments had no significant effects. The eontents of N, P and K in leaf litters were 43. 41 % , 52. 82 % , 36. 25 % , lower than those in leaves respec­tively, showing intense net nutrient resorption. The eontents of Ca and Mg in leaf litters were 57.81 % and 44.06 % , higher than that in leaves, showing accumulation in leaf litters. N, Ca and Mg eontent in plant leaves were positively related to their content in leaf litters. [Conclusion]Nutrient resorption efficiencies showed positive correlations with nutrient eontent in leaves, indicating that species containing higher nutrients could reuse more nutrients under the same environments. [ABSTRACT FROM AUTHOR]

Field investigation and the mathematical statistic method were conducted to investigate the effect of environmental factors on the cadmium uptake of heavy metals in rice. The results showed that there was a negative correlation between Cd and soil pH, Mn, Fe, Zn, Mg, Mn, and among them the soil pH were significantly negative correlated with Cd (- 0. 672) ; whereas the correlation coefficient between Cd, the soil organic matter, available Cd, and total Cd were positively correlated, in which the soil organic matter and available Cd were significantly positive correlated with Cd. The correlation coefficients were 0. 579 and 0. 631 , respectively. [ABSTRACT FROM AUTHOR]

Based on the scientific fertilization in Korla fragrant pear orchard,the 6 years Korla fragrant pear was taken as experimental material,and the regularity of nitrogen absorption and accumulation of Korla fragrant pear tree were studied with the method of the whole excavation and the organ dissection. The results showed that the single Korla fragrant pear tree could absorb nitrogen 96. 11 g from the soil in the annual growth, which the nitrogen absorption of flower stage accounted for 20. 86 %,the nitrogen absorption of fruit setting stage accounted for 27.93 %, and the nitrogen absorption of fruit expanding stage accounted for 41. 26 %, flower stage, fruit setting stage and fruit expanding stage were the three key period of nitrogen nutrition of Korla fragrant pear tree. Korla fragrant pear leaves carried away of nitrogen 38. 74 g in the annual growth,which accounted for 40. 31 % of total nitrogen absorption. Korla fragrant pear fruits carried away of nitrogen 24. 45 g in the annual growth,which accounted for 25. 44 % of total nitrogen absorption. The new organs leaves and fruits were the main sites of nitrogen absorption, accumulation and distribution in the various organs of Korla fragrant pear tree. Took the yield 5. 77 t / hm2(12. 82 kg / plant)of the 6 years Korla fragrant pear as the production target,and the recommended quantity of N was 135. 25 kg / hm2. [ABSTRACT FROM AUTHOR]

In order to elucidate the effects of V5+ toxicities on the growth and the nutrients absorption of Sedum spurium cv. Coccineum and provide a theoretic foundation for ecological remediation of V-contaminated soil, the hydroponic culture experiments were conducted. The improved Hoagland nutrient solutions were treated by adding NaVO3 with the V5+ concentrations of 0, 2. 5, 5. 0, 12. 5, 25. 0 and 50. 0 mg • L-1，respectively. The results showed that V5+ had an inhibition on the stem length, root length and the fresh mass of roots, shoots and leaves of the tested plants after a cultivation of 2 months. With the increase of V5+ concentration, the chlorophyll (a + b) contents firstly increased, and then decreased gradually. The levels of V in root，shoot and leaf raised with the adding V5+ concentration in the solution, the biological absorption coefficient (BAC) of roots was always higher than that of aerial parts, and the contents of V in the plants had some effects on the uptake of other nutrients. [ABSTRACT FROM AUTHOR]