Individual study: Nitrogen mineralization, microbial biomass and crop yield as affected by wheat residue placement and fertilizer in a semi-arid tropical soil with minimum tillage
Singh H. (1995) Nitrogen mineralization, microbial biomass and crop yield as affected by wheat residue placement and fertilizer in a semi-arid tropical soil with minimum tillage. Journal of Applied Ecology, 32, 588-595
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Amend the soil using a mix of organic and inorganic amendments
A controlled, randomized, replicated experiment in 1990-1992 on silty-loam soil in India (Singh, 1995) found highest nitrogen levels in soil under fertilizer addition plus wheat residue(4.6-16.6 μg/g/month) followed by the fertilizer-only (4.2-14.3 μg/g/month) and wheat residue-only treatments (4-11.2 μg/g/month), compared to the untreated control (3.4-9.8 μg/g/month). The highest microbial biomass was 400 μg/g under fertilizer plus wheat residue (), compared to 254 μg/g in the control. There were four treatments replicated three times in 5 x 4.2 m plots: control, chemical fertilizer (NPK at 80/40/30 kg/ha), wheat residue (1 kg/m2), wheat residue plus fertilizer (at 50% fertilizer, 50% wheat residue). The crop sequence was a fallow-rice Oryza sativa-lentil Lens culinaris rotation. Wheat residue was lightly incorporated whereas fertilizer was applied to the soil surface. Soils were sampled at the end of the experiment to 10 cm depth.