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Birsa Agricultural University, Ranchi

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Subject: Agricultural Physics and Meteorology × End date: 1996 × Start date: 1996 ×
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    ThesisItemOpen Access
    Physical Characterization of Acid Soil As Influenced By Crop Waste Incorporation
    (Birsa Agricultural University, Ranchi, 1996) Manoj Kumar; P.K.Roy
    The influence of 10t/ha of crop waste incorporation into the soil either alone or in combination with different doses of chemical fertilizers ( 50 per cent, 75 per cent an d100 per cent of the recommended dose of NPK) for a period of the last five years showed marked improvement in the physical properties of soil. The texture of the soil was clay loam in all the plots under all the treatments (Sand around 42.8 percent, slit around 27.4 percent and clay around 29.5 percent).Incorporation of crop waste alone or in combination with chemical fertilizers decreased the bulk density by about 10.45 percent, increased the total porosity by 16.24 per cent ,aeration porosity by 63.56 percent water stable aggregates greater than 0.25 mm by 27.1 per cent and geometric mean diameter by 23.13 percent as compared to control. Values of aeration porosity higher than 10 percent in all the plots(varing between 10.12 and 16.81 per cent ) compared with control (9.66per cent ) indicate that the soil was well acrated and would not adversely effect the plant growth About 14.23% increased in the moisture contenect at 0.033 NPA soil moisture tension in the plot treated with crop waste alone or in combination with chemical fertilizer around 23.84% compared with control and plot treated with chemical fertilizer along (around 20.87%) was observed..The application of chemical fertilizer ,however ,deteriorated the soil moisture retention capacity at 1.5MPa of soil moisture tension by about 17.6%. Incorporation of crop waste along or in combination with chemical fertilizers increased the profile moisture content (weighted average of 0.60cm soil depth )of soil at 21,36,51,64 and 109 days after sowing by about 15.54% as compared with control and plots treated with chemical fertilizers both having similar values crop waste increased the infiltration rate by 39.68% ,cumulative infiltration by 43.66%and hydraulic conductivity by39% over control. Depth by variation of soil temperature in the crop waste treated crop was about 4 degree c at 6am and 2 pm and about 2.5degree c at 10pm on 21 days after sowing of crop as against a higher variation in soil temperature in control and plot treat with chemical fertilizers alone(5.5degreec at 6 am and 2 pm and 3.5degree c at 10pm)a reduction of 5degree c in the diurnal variation due to incorporation of crop waste was recorded. Crop waste increased the organic carbon content of soil by 51.76%ascompared with control. The highest uptake NPK ,9(N-82.57kg ha,p-30.45kg ha,K-120.51kg ha-1)was recorded in the plots treated with 100%NPK either alone or in combination with crop waste in corporation. Highest grain and straw yield (around 27.32qha of grain and around 32.58q hectare-1 of straw.)where obtained in the plots treated with 75%NPK and 100%NPK either alone or in combination with crop waste. However, the higher leaf area index was recorded in the plots treated plots either with 100%NKP alone or in combination with crop waste.