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【Objective】 This paper aimed to explore effects of reduced chemical fertilizer and soil texture on yield, quality and nitrogen（N）, phosphorus（P） and potassium（K） fertilizer utilization rate of flue-cured tobacco. 【Method】 Using flue-cured tobacco variety K326 as material, a field experiment was established in sandy soil, clay soil and heavy loam in Qujing tobacco production site, and six fertilization treatments were set up, i.e., T1（CK）（conventional dosage of N, P, K）, T2 and T3（deduced fertilizer N, P, K proportion by 10% and 20%, respectively）, T4 and T5（organic fertilizer replacing 10% and 20% chemical fertilizer, respectively） and T6（no manure or fertilizer）. 【Result】Compared with treatment T1（CK）, treatments T2, T3 significantly improved grade, yield, economical output and N, P, K use efficiency of tobacco leaves in sandy soil. Meanwhile, treatments T2, T3 increased contents of potassium, decreased total sugar, reducing sugar. The contents of total nitrogen, nicotine and water-soluble chloride in the middle and upper parts of leaves were not significantly affected; and the chemical composition was more balanced under T2 and T3. Compared with treatment T1（CK）, treatment T2 and T5 did not significantly improved growth of the tobacco plants in clay soil, but the proportion, yield, output and N, P, K use efficiency under T2 and T5 in tobacco leaves were significantly higher than that of T1（CK）, and the chemical composition of middle and upper position leaves was more balanced. Compared with T1（CK）, treatments T2, T3, T5 had no effect on tobacco plant growth in heavy loam, but improved the proportion of products, yield, output, N, P, K use efficiency of tobacco. Furthermore, the contents of total sugar, reducing sugar of middle and upper part leaves were increased under T2, T3 and T5. The total nitrogen, nicotine, potassium and water-soluble chloride were not affected by treatments. And treatments T2, T3 significantly improved the balance of chemical composition of tobacco leaves. Under the same N, P and K application rate, the N and P uptake and use of tobacco plants in different soils could be sorted as the following: Sandy soil>heavy loam>clay soil, and K use efficiency as the following: Heavy loam>clay soil>sandy soil. 【Conclusion】Based on the current N, P and K usage of tobacco in farmlands, the potential N, P and K proportion of chemical fertilizer reduction（CR） or replacement with organic fertilizer（ROR） in sandy soil was 10%. The N, P and K proportion of CR or ROR in clay soil was 10%-20%. The potential reduction of N, P and K fertilizer in heavy loam was 10%, and the potential proportion ROR was 10%-20%. [ABSTRACT FROM AUTHOR]

[Objective] This paper aimed to the problem that application of chemical fertilizers and pesticides and long-term continuous culti vation mode in the industry caused the yield and quality of Lycium barbarum L had declined in recent years, and the effects of different mi crobial agents on the growth and development of the L. barbarum L. and fruit yield and quality were studied. [Method] Ningqi No. 7 L. barba rum L. was used as experimental material, and the field trials with no microbial agents as a control were conducted by the application of Tl, T2, T3 three microbial agents. [ Result] Each treatment had different degrees of promoting effects on the vegetative growth, reproductive growth, yield and quality of L. barbarum L. plants. Microbial agents could significantly increase the survival rate of first-year L. barbarum L. seedlings, and the amount of roots and branch growth by 9. 06% - 57. 84% and 4. 76% - 54. 9%, respectively; Microbial agents could in crease the number of branches, branch growth and SPAD value of fourth-instar L. barbarum L. plants by 29. 9% - 87. 09%, 7. 5% - 18. 3%, and flower formation rate, fruit setting rate, 100-seed weight and yield by 2. 07% - 18. 87%, 3.19% - 13. 63%, 0.57% - 4. 92%, 29. 7% - 52. 7%, respectively; Especially, T2 had the most significant effect, compared with other treatments, the amount of branches, flower formation rate and yield were increased by 30. 05%, 12. 23% and 4. 45%. Microbial agents could significantly improve fruit quality and increase the content of polysaccharides, betaine, total flavonoids, and carotene in L. barbarum L. fruit by 4. 55% 25%, 25. 5% - 43. 67%, 12. 5% - 58%, and 2. 8 - 3. 6 times, respectively. Especially, Tl had the most significant effect on the improvement of quality indicators, compared with other treatments, the content of polysaccharides, betaine and carotene increased significantly by 5. 77%, 8. 52% and 23. 78%. [ Conclusion] Comprehensive evaluation of the analysis results showed that the three combinations of microbial agents tested had a certain positive effect on growth of L. barbarum L. . T2 had the most significant effect on tree growth, yield and economic benefits, Tl had the best effect on fruit quality, and it could be used for reference and promotion according to production needs in production practice, Tl and T2 could be used together to achieve the effect of improving quality and increasing production. [ABSTRACT FROM AUTHOR]

[Objective] The present paper aimed to clear the effects of different biological agents on tomato growth. [Method] This study designed field split plot experiment and adopted biometrical method to research the effects of Bacillus subtilis agent(30 kg·hm-2), Trichoderma humatum agent(22.5 kg·hm-2), Yufeng ‘99’agent(30 kg·hm-2), Zhongnonglyukang agent(45 kg·hm-2) on tomato growth, yield, quality and soil physico-chemical properties in 2017-2018, and the application effects were compared and analyzed with the conventional chemical fertilizer(2179.5 kg·hm-2) simultaneously. [Result] There were obvious promotion effects on tomato growth, yield and quality when four biological agents applied. The tomato height increased by 10-26 cm and the stem diameter increased by 0.6-3.0 cm compared with the control. The fruit yield was increased significantly under different biological agents application, which was 1.22-1.53 times higher than that of the control and was 34.33 %-53.65% higher than that of the chemical fertilizer treatment.Besides, the incidence rate of umbilical rot and gray mold diseases of tomato were significantly reduced. The external and internal quality of tomato were improved in each agent application treatment, comparing with the chemical fertilizer treatment, the fruit color uniformity and maturity were increased significantly, and comparing with the control, the fruit Vc content increased by 14.40%-49.94 %, the sugar content increased by 8.68 %-37.85 %, and the titratable acidity reduced by 28.89%-56.76%.Meanwhile, these biological agents application through drip irrigation had significant effect on physico-chemical properties, compared with the chemical fertilizer treatment, the organic matter content increased by 30.43 %-83.48 %, and the soil pH and conductivity decreased slightly, which reduced the occurrence of soil salinization, and compared with the control treatment, the organic matter content increased by 66.67%-134.44 %, and the available nitrogen, phosphorus and potassium also increased significantly. These data showed that the four biological agents could improve soil fertility. [Conclusion] This stuly indicated that the four biological agents could promote tomato growth, reduce diseases and improve yield and quality, the order of the promotion effects was as follows:yufeng‘99’agent> Zhongnonglyukang agent> Bacillus subtilis agent> Trichoderma humatum agent, which was closely related to component and mechanism of different biological agents and the effects of agents on soil microenvironment. [ABSTRACT FROM AUTHOR]

[Objective] The purpose of this paper is to provide theoretical basis for efficient fertilization of pepper in yellow soil region of Guizhou province. [Method] Field test method was used to test the application of three slow-release fertilizers(stable fertilizer, nitro dualeffect fertilizer and controlled-release fertilizer) on pepper in the typical yellow soil area of Guizhou province, and to study their effects on yield, quality, nutrient absorption and fertilizer utilization of pepper. [Result]The yield of pepper increased by 14. 3 %-19. 4 % after applying three slow-release fertilizers, which was significantly higher than that of conventional fertilization and no fertilization. The amino acid content of pepper was 8. 9 %-22. 7 % higher than that of conventional fertilizer, and the crude protein content was 2. 4 %-10 % higher. The nutrient contents of pepper leaves, stems and fruits were improved as well as the agronomic efficiency, partial nitrogen productivity and apparent nitrogen utilization rate of pepper. [Conclusion] The application of three slow-release fertilizers significantly increased the yield of pepper, improved the quality of pepper and increased the fertilizer utilization rate of pepper. [ABSTRACT FROM AUTHOR]

[Objective] The purpose of this paper is to improve the yield and quality of Chinese bayberry and promote the development of green-efficient bayberry industry. [Method] Taking Biqi bayberry as test materials, the application of humic acid soluble fertilizer(HASF)was studied for higher yield and better quality fruit, while two field experiments were conducted in Fumin County and Panlong District, Yunnan Province. [Result] The results showed that the yield and fruit quality were improved by spraying HASF with 800-1000 times concentration at pre-flowering, young fruit and fruit enlarged stage, based on conventional fertilization. The average single fruit weight, yield and net income of bayberry of spraying HASF were significantly higher than those of spraying water(CK), with up to 27. 86 %-31. 54 %, 13. 0 %-13. 4 % and 13. 8 %-14. 2 %, respectively, and the contents of soluble solids and vitamin C(Vc) increased by 18. 4 %-19. 54 %and 18. 56 %-24. 9 %, respectively. However, compared with conventional fertilization, spraying water had no significant effect on fruit yield and quality. [Conclusion] The yield, quality and economic benefit of bayberry could be improved significantly by applying HASF. [ABSTRACT FROM AUTHOR]