Integrated nutrient management in maize (Zea mays)–gobhi sarson (Brassica napus ssp oleifera var. annua) cropping system under rainfed condition

An experiment was conducted during 1998–99 to 2000–01 to work out an integrated nutrient management schedule for maize (Zea mays L.)–gobhi sarson (Brassica napus ssp oleifera var annua) cropping system under rainfed conditions. The total grain production was higher (110.5 q/ha) when both crops in system were given 150% of recommended NPK and was 28 and 26% higher over recommended fertilizer application in maize and gobhi sarson respectively. However, an application of 150% of recommended NPK to maize and 100% NPK + 10 tonnes/ha farmyard manure (FYM) to gobhi sarson also resulted in statistically similar grain yield (108 q/ha). Application of 10 tonnes FYM along with 100% NPK either to one crop or both crops increased the system productivity by 7.7% over 100% NPK, application only. The N,P and K uptake in system was higher when both crops in system were given 150% NPK, followed by 100% NPK + 10 tonnes FYM/ha application. Higher gross returns (Rs 75,251) and benefit: cost ratio (2.68) were obtained when both crops in system were given 150% of recommended NPK. Application of recommended NPK to both crops although gave lower gross returns (Rs 56,786), the benefit: cost ratio of 2.18 was most practical under limited resources.