Effect of tillage, residue and potassium management on yield an nutrient concentration of maize under conservation agriculture

摘要

A field experiment was conducted at New Delhi in 2016 to study the effect of tillage, residue and time of potassium application on the growth parameters, yield and nutrient concentration of maize. Treatments comprised of tillage and residue retentionin main plots and timing of potassium application in sub plots. Main plot treatments were-T ZT+wheat residue (3 tonne/ha), T2: ZT-bed + wheat residue (3 tonne/ha) and T3: CT-no residue. Sub plot treatments were- K.: recommended dose (RD) as basal (60 kgKp/ha), K2:l/2 RD at sowing + 1/2 RD at tasseling, K,: xh RD at sowing + V4 RD at silking and K4: 1/3 RD at sowing + 1/3 RD at knee height + 1/3 RD at tasseling. It was found that tillage with residue retention and timing of potassium application exertedsignificant effect on enhancing plant growth parameters, growth indices (CGR and RGR) and grain yield of maize at all the growth stages. The maximum values of growth parameters and yield was obtained under ZT-bed + wheat residue (3 tonne /ha) followed by ZT + wheat residue (3 tonne/ha) and CT-no residue. Likewise the treatment 1/2 RD at sowing + 1/2 RD at tasseling showed significantly higher values of growth and yield than all other treatments in conditions like semi-arid climate of north India.