KHALID AHMADY, K.V. NAGA MADHURI*, P.V.R.M. REDDY and S. HEMALATA Department of Soil Science and Agricultural Chemistry, S.V. Agricultural College, ANGRAU Tirupati, – 517 502, Chittoor Dt., A.P., India

ABSTRACT

An experiment on long -term application of fertilizers and manure on soil properties and yield of rain fed groundnut mono cropping system was initiated in the year 1981 during kharif season at Regional Agricultural Research Station, Tirupati, Andhra Pradesh, India. The same experiment was used for the present investigation during kharif, 2018 season, to study the influence of long-term application of fertilizers and manure on soil nutrient status and yield of groundnut. The experiment has eleven treat-ments each replicated four times in a randomized block design. The treatments include T1: Control (no manure or fertilizers), T2 : Farm yard manure @ 5 t ha-1 (once in 3 years), T3: 20 kg nitrogen (N) ha-1, T4: 10 kg phosphorus (P) ha-1, T5: 25 kg potassium (K) ha-1, T6: 250 kg gypsum ha-1at flowering stage, T7: 20 kg N + 10 kg P ha-1, T 8: 20 kg N + 10 kg P + 25 kg K ha-1, T9: 20 kg N + 10 kg P + 25 kg K + 250 kg gypsum ha-1 at flowering stage, T10: 20 kg N + 10 kg P + 25 kg K + 100 kg lime ha-1 at flowering stage, T11: 20 kg N + 10 kg P + 25 kg K + 250 kg gypsum ha-1at flowering stage+ 25 kg zinc sulphate ha-1 (as basal, once in 3 years). Incorporation of chemical fertilizers in combination with N since 38 years had significantly influenced the available nitrogen content of the soil. However, the soil available nitrogen was in deficient range in all the treatments. The soil available phosphorus was depleted in all the treatments at both depths over a period of 38 years except in only P and NPK+lime (T10)at surface (0-15 cm)in which observed a little increase in available P. Similarly, soil available potassium was depleted as compared to initial potassium and the decrease was noticed with the treatments where K is not included and available K was higher in the treatments where potassium was included as compared that of other nutrients during kharif, 2018.The application of NPK (20:10:25 kg ha-1) + lime (100 kg ha-1) recorded significantly higher pod yield followed by NPK+ gypsum, NPK, and NPK+ gypsum+ ZnSO4 and haulm yield was high in NPK+gypsum and NPK+gypsum+ ZnSO4. The results revealed that there is a significant influence of long- term use of manure and fertilizers on the productivity of rainfed groundnut and soil nutrient status in Alfisols of Chittoor district

KEYWORDS:

Groundnut, long-term fertilizer use, crop yield, soil nutrient status