A four-year study was conducted at Malepatan, Kaski on different combinations of manure and fertilizers to improve the productivity of acidic soil. Nine treatments with three replications were given in the soil and cowpea was grown. Soil analysis was done each year (2064-2067) to know the status of soil pH, organic matter, nitrogen, phosphorus and potassium content in the soil. The data on fresh pod yield of cowpea was collected and analyzed. The mean value on soil pH observed the highest (5.19) when FYM applied alone @ 10 t ha-1. The percent organic matter and nitrogen content of the soil observed the highest (3.56 and 0.177, respectively) due to the application of FYM @ 5 t ha-1 + N:P2O5:K2O @ 60:40:60 kg ha-1, respectively. The available phosphorus content of the soil observed the highest (68.42 kg ha-1) when poultry manure applied alone @ 2 t ha-1 and followed (64.0 kg ha-1) by the application of N:P2O5:K2O @ 60:40:60 kg ha-1, respectively + poultry manure @ 1 t ha-1. The amount of potassium content of the soil observed the highest (130.58 t ha-1) due to application of N:P2O5:K2O @ 60:40:60 kg ha-1, respectively. The fresh pod yield of cowpea was the highest (5197.6 kg ha-1) due to the application of poultry manure @ 1 t ha-1 + N:P2O5:K2O @ 40:20:40 kg ha-1, respectively. This study revealed that the application of higher dose of FYM helps to improve the soil pH. The application of higher dose of chemicalfertilizer in addition to FYM helps to increase the percent organic matter and nitrogen content in the soil. The phosphorus status and fresh pod yield of cowpea can be improved through the use of poultry manure in combination with chemical fertilizer.

A four-year study was conducted at Malepatan, Kaski on different combinations of manure and fertilizers to improve the productivity of acidic soil. Nine treatments with three replications were given in the soil and cowpea was grown. Soil analysis was done each year (2064-2067) to know the status of soil pH, organic matter, nitrogen, phosphorus and potassium content in the soil. The data on fresh pod yield of cowpea was collected and analyzed. The mean value on soil pH observed the highest (5.19) when FYM applied alone @ 10 t ha-1. The percent organic matter and nitrogen content of the soil observed the highest (3.56 and 0.177, respectively) due to the application of FYM @ 5 t ha-1 + N:P2O5:K2O @ 60:40:60 kg ha-1, respectively. The available phosphorus content of the soil observed the highest (68.42 kg ha-1) when poultry manure applied alone @ 2 t ha-1 and followed (64.0 kg ha-1) by the application of N:P2O5:K2O @ 60:40:60 kg ha-1, respectively + poultry manure @ 1 t ha-1. The amount of potassium content of the soil observed the highest (130.58 t ha-1) due to application of N:P2O5:K2O @ 60:40:60 kg ha-1, respectively. The fresh pod yield of cowpea was the highest (5197.6 kg ha-1) due to the application of poultry manure @ 1 t ha-1 + N:P2O5:K2O @ 40:20:40 kg ha-1, respectively. This study revealed that the application of higher dose of FYM helps to improve the soil pH. The application of higher dose of chemicalfertilizer in addition to FYM helps to increase the percent organic matter and nitrogen content in the soil. The phosphorus status and fresh pod yield of cowpea can be improved through the use of poultry manure in combination with chemical fertilizer.