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Jawaharlal Nehru Krishi Vishwa Vidyalaya, Jabalpur

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2016 - 20202
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Subject: Soil Science and Agriculture Chemistry × Author: Jakhar, Shish Ram × Start date: 2002 × Type: Thesis ×
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    ThesisItemOpen Access
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    ThesisItemOpen Access
    Efficiency evaluation of liquid and carrier based rhizobium inoculants at different levels of phosphorus on soybean
    (JNKVV, 2016) Jakhar, Shish Ram; Mitra, N.G.
    ABSTRACT The present investigation was carried out to evaluate the effectiveness of Rhizobium cultures with supplementation of inorganic P fertilizer on soybean (cv. JS 97-52) growth, yield, nutrient uptake, rhizobial population and major nutrients in a black soil. In view to this, an investigation entitled “Efficiency evaluation of liquid and carrier based Rhizobium inoculants at different level of phosphorus on soybean” was laid out in the research field of the Department of Soil Science & Agricultural Chemistry, JNKVV, Jabalpur during Kharif season 2015. The field soil was initially low in N and rhizobial population. The experiment comprised of 12 different treatments including 2 types soybean rhizobial inoculations (liquid and carrier based) in combination with 3 different levels of inorganic P supplementation (@ 40, 80 and 120 kg P2O5/ha) and one control of unfertilized+uninoculated (UFUI). The treatments were tried in plots of 3 replications under randomized block design. Gross plot size used was 3m x 2m = 6m2 maintaining row to row and plot to plot distance 1 and 0.5 m, respectively. Other package of practices including application of fertilizers @ 20:20 kg/ha (N: K2O) were followed as recommended, application of phosphorus was taken as parts of scheduled treatments. As per programme of the experimentation, the crop was sown on 14thJuly 2015 and harvested on 27thOctober 2015 and observations were recorded for plant height and biomass and leaf chlorophyll content at 45 DAS, nodulation attributes at 21 and 45 DAS, N and P contents and uptakes by the crop and yields of grain and stover at harvest and status for pH, OC and available NPK in post-harvest soil samples. The data on various parameters were processed and computed statistically for test of significance of treatment means. Form the experimental observations on the different parameters, the significant findings were interpreted as the influence of Rhizobium inoculum (liquid and carrier based) at different level of inorganic phosphorus on crop growth and yield, major nutrients and rhizobial population in soil at different crop growth stages. The treatment of P80+LRh (inorganic fertilizer @ 80 kg P2O5 +liquid inoculum of Rhizobium) responded statistically better for enhancing plant height (45.00%), chlorophyll content (54.95%), plant biomass (59.93%), nodules number (81.17%), weight (89.10% fresh and 78.55% dry), and N content (64.42%). The same treatment combination increased available N and P in soil at harvest by 42.85 and 92.85%, respectively over control (189 kg N and 14 kg P/ha, respectively) and the uptakes of N and P in the crop by 143.56 and 158.10%, respectively over the control (90.2 kg N and 7.4 kg P/ha, respectively). The treatment of P80+LRh also economically increased grain yield of soybean by 75.41% over the control (1025 kg/ha) and straw yield by 88.80% over the control (2206 kg/ha). Population of Rhizobium in rhizospheric soil of soybean was found more with the treatment of P80+LRh by 1.69, 1.55 and 1.57 log folds, respectively over the control [3.297 log cfu = 1.98×103 cfu/g soil at 21 DAS, 5.499 log cfu = 3.15×105 cfu/g soil at 45 DAS and 4.619 log cfu = 4.15×104 cfu/g soil at harvest]. While the treatment of P120+LRh exhibited numerically higher values but statistically non-significant to that of the former. Further, P80+LRh responded better than P80+CRh.