Vol. 12, Issue 10 (2023)

Author(s):
K Vineela, K Chandrasekhar, S Prathibha Sree and M Raghavendra

Abstract:
A field trial was conducted on clay soils of Advanced Post Graduate Centre, Lam, Guntur to study the effect of different nitrogen fertigation levels at different stages of maize on NPK uptake during rabi 2019-20. The experiment was laid out in RBD with twelve treatments i.e., 100% recommended dose of nitrogen (RDN) through soil application under surface irrigation (T₁), 100% and 75% RDN through soil application under drip irrigation (T₂ and T₃ respectively), 100%, 75% and 50% RDN through fertigation up to 60 DAS (T₄, T₅ and T₆ respectively), 100%, 75% and 50% RDN through fertigation up to 75 DAS ( T₇, T₈ and T₉ respectively) and 100%, 75% and 50% RDN through fertigation up to 90 DAS ( T₁₀, T₁₁ and T₁₂ respectively) and they were replicated thrice. Nitrogen uptake in maize kernel and stover were significantly more in the treatment fertigated with 100% RDN up to 90 DAS (T₁₀). The uptake of phosphorous in maize kernel and stover were significantly higher with the treatment receiving 100% RDN through soil application under surface irrigation (T₁) when compared to all other treatments. Potassium uptake in maize kernel was significantly superior with the treatment 100% RDN through fertigation up to 90 DAS (T₁₀) over all other treatments. However, at harvest, application of 100% RDN through soil under surface irrigation (T₁) recorded significantly the highest uptake of potassium in stover over all other treatments.