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Effect of detopping and mepiquat chloride on morphological, physiological and yield attributes of soybean cultivar 'SL 544' was studied. A two year investigation was conducted at Punjab Agricultural University, Ludhiana, during kharif seasons of 2014 and 2015. The experiment was laid-out in randomized complete block design (RCBD) with eight treatments viz. control, detopping (removal of 4- 5 cm apical portion of main stem) at 50-55 days after sowing (DAS), mepiquat chloride @ 200 ppm (50-55 DAS), mepiquat chloride @ 200 ppm (50-55 + 65-70 DAS), mepiquat chloride 250 ppm (50-55 DAS), mepiquat chloride @ 250 ppm (50-55 + 65-70 DAS), mepiquat chloride @ 300 ppm (50-55 DAS) and mepiquat chloride @ 300 ppm (50-55 + 65-70 DAS) with four replications. Detopping had a non-significant effect on leaf area index, SPAD value, PAR interception, abscission of reproductive parts, seeds per pod, 100- seed weight, pod length and stover yield of soybean. It significantly decreased plant height, increased total dry matter accumulation/ plant, number of flowers and pods/plant, pod setting percentage and seed yield over control during 2014 and 2015. At crop harvest, detopping developed optimized source-sink relationship by means of distribution of total dry matter between stem, foliage and pods by 20.4, 14.9 and 64.6 % during 2014 while 22.6, 20.1 and 57.4 % during 2015, respectively. Mepiquat chloride posed a nonsignificant effect on plant height, PAR interception, number of flowers/plant, number of seeds/pod, pod length and stover yield of soybean but it significantly decreased leaf area index, abscission of reproductive parts while increased the dry matter accumulation/ plant, number of pods/plant, 100-seed weight and seed yield relative to control. At harvest, two foliar applications of mepiquat chloride @ 250 ppm resulted in optimized source-sink relationship by the distribution of total dry matter among stem, foliage and pods by 20.6, 10.9 and 68.5 % durin. [ABSTRACT FROM AUTHOR]

A field experiment was conducted during summer season of 2013 in the Department of Agronomy, Punjab Agricultural University, Ludhiana, Punjab to study the effect of growth regulation on growth and yield attributes of summer moongbean. The field experiment comprising eight treatments viz., control and seven growth regulation treatments (detopping, MC (mepiquat chloride) @ 200, 250 and 300 ppm applied once at 35 days after sowing (DAS) and twice at 35 and 45 DAS was conducted in a randomized complete block design (RCBD) with four replications. The grain yield obtained with foliar application of MC @ 250 ppm at 35 and 45 DAS (10.05 q/ha) was significantly higher than control (6.70 q/ha). Various growth parameters and yield attributes (dry matter accumulation and number of pods per plant) were also significantly higher with MC @ 250 ppm (35 and 45 DAS) as compared to control. Detopping resulted in highest leaf area index (LAI), whereas all other growth regulation treatments were significantly better than control. Detopping resulted in significant reduction in plant height than control but was statistically at par with two applications of MC @ 250 and 300 ppm and single application of MC @ 300 ppm (35 DAS). Flower drop per plant was significantly reduced by two applications of MC @ 300 ppm. Quality parameters such as nitrogen and protein content in grains remained unaffected by growth regulation treatments. Nodule count and weight per plant were also unaffected by growth regulation treatments. Similarly, no effect on crop phenology was observed by any of the applied treatments. [ABSTRACT FROM AUTHOR]

A field experiment was conducted during rabi 2011-12 to study the effect of plant growth regulation and sowing time on growth and yield of kabuli gram. The experiment was laid out in split plot design with four replications. The main plots comprised three dates of sowing i. e. October 10, October 25 and November 10. The growth regulation practices viz., detopping, mepiquat chloride (MC) @ 250 ppm and MC @ 500 ppm applied as foliar spray at 40 and 70 days after sowing (DAS) along with unsprayed control were kept in sub-plots. November 10 sown crop produced significantly higher dry matter (39.5 g/plant), more number of primary (5.3) and secondary (17.3) branches, flowers (88.6) and pods (55) per plant, and grain yield (21.1 q/ha) than October 10 and October 25 sown crop. MC @ 500 ppm applied at 70 DAS produced significantly higher grain yield (18.13 q/ha) which was statistically at par with MC @ 500 ppm (17.47 q/ha) applied at 40 DAS. Detopping failed to influence the seed yield significantly over control. Higher concentration of MC significantly increased the number of branches, flowers and pods per plant than its lower concentration and detopping. Foliar application of MC significantly increased the total chlorophyll and chlorophyll 'a' content. [ABSTRACT FROM AUTHOR]

A field experiment was conducted during 2005-07 under irrigated conditions to study the influence of integrated nutrient and agronomic management on growth, yield and nutrient uptake by soybean and on soil health. The results revealed that application of FYM with NP or NPK improved the yield of soybean over NP or NPK alone treatment. Integrated use of FYM with NPK increased the yield of soybean by 5.9 per cent over NPK alone. Additional application of 30 kg N ha-1 at pre-flowering or at pod initiation did not increase the yield over the basal dose of NP applied at sowing. Use of 4 tonnes wheat straw mulch + 30 kg N, 60 kg P2O5 and 30 kg N, 60 kg P2O5 ha-1 showed similar effect on seed yield of soybean. Conventional flat sowing and bed sowing of soybean were equally effective in influencing the soybean yield. Pre-emergence application of pendimethalin at 1.5 1 ha-1 along with one hand weeding at 40 days after sowing (DAS) and two hand weeding at 20 and 40 DAS were equally effective for weed control and in influencing the soybean yield. The application of N, P, K, FYM, in different treatments, treatment with Bradyrhizobium japonicum and sowing on beds all significantly improved the N, P and K uptake by soybean. The inclusion of FYM in the fertilizer treatment resulted in maximum increase in the uptake of these nutrients. The available N and P of the soil also increased but the changes in available K remained inconsistent with different growth factors. Application of FYM increased the organic carbon content of the soil in different treatments. [ABSTRACT FROM AUTHOR]