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Department of Agronomy, S.V. Agricultural College, ANGRAU, Tirupati-517502.
A field experiment was carried out during rabi, 2019-20 and rabi, 2020-21 on sandy loam soils of Krishi Vigyan Kendra, Utukur, Kadapa, Andhra Pradesh. The experimentation was laid out with three replications by adopting split-split design. Groundnut variety Kadiri-6 was used for the investigation. The treatments include combination of three dates of sowing, four plant plant spacings and three nutrient levels. The highest post-harvest soil available nitrogen and potassium was estimated when the crop was sown during I fortnight of October (D1) while the minimum values of above said nutrients was noticed with I fortnight of November (D3) sowing. However, post-harvest phosphorus during both the years of study and in pooled mean was not affected due to dates of sowing. Crop sown with 22.5 cm x 10.0 cm plant spacing resulted in higher post-harvest soil available nitrogen, phosphorus and potassium while criss cross sown crop at 22.5 cm of row spacing in both the directions recorded significantly lower values of soil available nutrients. With regard to nutrient levels, significantly higher post-harvest soil available nitrogen, phosphorus and potassium was obtained with the application of 150% RDF (N3) which was at par with application of 125% RDF and the lowest values were noticed with 100% RDF (N1) during both the years of study and in pooled mean.
KEYWORDS: Dates of Sowing, Plant spacing, Nutrient levels, Nitrogen, Phosphorus, Potassium, Groundnut.