Evaluation of the interactions of sowing date, fertility, shoot fly protection level and cultivar in rabi sorghum
2011
e a h e a elbashir
The direct and interaction effects of planting date, fertility, shoot fly (Atherigona soccata) control and cultivar on growth and development, resource use efficiency, grain, fodder, and biomass yields in sorghum were investigated at ICRISAT during rabi 1995 and 1996 at deep and shallow vertisol sites. The study indicated that the interactions of sowing date x genotype, fertility x genotype and protection x genotype were important considerations for increased rabi sorghum productivity. This was true since the three genotypes had different response across management treatments in that differences in leaf area index, total dry weight, resource use and use efficiency as well as yield and yield components in M35-1 and Swathi were small at early and normal planting, but these parameters were significantly enhanced in IC94004 when it was sown early. On the otherhand, yield and yield components in IC94004 and M35-1 significantly responded to increased fertility levels (to F3) than in Swathi (to F2). The response of genotypes to protection when normally sown was significantly greater in IC94004 than either genotypes, indicating that when sowing was delayed to normal, protection was necessary in IC94004, but not necessarily so with M35-1 or Swathi. The path coefficient analysis indicated that rabi sorghum grain yield was highly correlated to the direct effect of total N uptake,total WUE, panicle number per unit area, grain number per panicle and harvest index. The direct effect of cumulative radiation accumulation and evapotranspiration on rabi sorghum grain yield was not strong
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