In this study the hypotheses assumed was assessed through incubation study in lab. Soil samples were pre incubated at 25 °C for 1 week prior to actual incubation to stabilize the microbial activity. Moisture content of soil was adjusted to 60 % of water holding capacity by adding deionized water. There were three Rock Phosphates of origin Jhabua, Udaipur-I, Udaipur-II and eleven treatments including the control and soils were analysed at six incubation periods (15, 30, 45, 60, 90 and 120 days); with three replications to see the effectiveness of different RPs treated with organic acids and zeolite with phosphate solubilizing bacteria (PSB) viz., Pseudomonas fluorescence. The incubation experiment showed a positive impact of the organic acids and FYM with increasing days of incubation gaining highest peak at 60 days in their ability to release P from all the RP sources. Data from 45 to 60 Days After Incubation (DAI) were found most suitable for P availability point of view. URP II showed maximum available P with gluconic acid@20 mM (13.28 kg ha-1) with an increase of 39% followed by FYM @5 tonne ha-1 with available P (13.10 kg ha-1) and increase of 50.97% over control. JRP responded maximum with FYM @ 5 tonne ha-1(9.05 kg ha-1) available P with an increase of 36.35% followed by oxalic acid. The URP I maintained highest available P with oxalic acid@0.5 M (10.59 kg ha-1) with an increase of 44.51% followed by FYM @5 tonne ha-1.
Soybean is an important leguminous and oilseed crop of India and extensively grown all over Madhya Pradesh due to its wide adaptability to agro-climatic conditions. However a continuous decline in soybean productivity has been observed and nutrient imbalance is one of the important identified factors. The present study was conducted to explore the nutrient management option for sustained productivity of soybean. The performance of soybean crop under various nutrient management practices was studied with 9 different combinations of five levels of nitrogen (0, 20, 30, 40 and 60 kg ha-1), five levels of phosphorous (0, 13, 20, 26 and 35 kg ha-1), two levels of farm yard manure (0 and 6t ha-1) and two levels of crop residue (0 and 5t ha-1) replicated thrice. These combinations were T1-N0P0 (unfertilized control); T2-N20P13; T3-N30P20; T4-N40P26; T5-N60P35; T6-FYM6t+T2; T7-Residues 5t+T2; T8-FYM @ 6t ha-1 and T9-Crop residues 5t ha-1. The performance of soybean and change in soil properties were studied. The results revealed that, the combined application of organic and inorganic fertilizer application positively influenced the plant height, number of branches, number of pods plant-1, number of seeds pod-1, yield and test weight of soybean. Further, the combined application of FYM and inorganic fertilizers improved the soil organic carbon and nutrient availability.
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