Growth and yield of rice-wheat in response to integrated use of organic and inorganic N sources
Anwar, S.A. (Ayub Agricultural Research Inst., Faisalabad (Pakistan). Inst. of Soil Chemistry and Environmental Sciences) | Iqbal, M. (University of Agriculture, Faisalabad (Pakistan). Inst. of Soil and Environmental Sciences) | Anwar-ul-Hassan (University of Agriculture, Faisalabad (Pakistan). Inst. of Soil and Environmental Sciences) | Ullah, E. (University of Agriculture, Faisalabad (Pakistan). Dept. of Agronomy)
This study was conducted to evaluate the effect of integrated use of organic and inorganic nitrogen (N) sources on rice-wheat yield and yield parameters, soil organic carbon content and nitrate leaching. Fourteen treatments viz: control (No NPK), 100% N through fertilizer (Recommended NPK), 100% N through FM, 100% N through press mud, 100% N through poultry litter, 75% N through fertilizer + 25% N through FM, 75% N through fertilizer + 25% N through press mud, 75% N through fertilizer + 25% N through poultry litter, 50% N through fertilizer + 50% N through FM, 50% N through fertilizer + 50% N through press mud, 50% N through fertilizer + 50% N through poultry litter, 25% N through fertilizer + 75% N through FM, 25% N through fertilizer + 75% N through press mud, 25% N through fertilizer + 75% N through poultry litter were tested. All organic manures were well mixed in soil before filling the pots. The results indicated that maximum plant height, number of tillers, number of grains per spike/panicle, 1000 grains weight and paddy/grain yield was obtained in treatment where 75% N through chemical fertilizers and 25% N through poultry litter was applied. The highest soil organic carbon after the harvest of rice and wheat was obtained in treatment where 100% N was applied through farm manure while soil nitrate was maximum in treatment where 75% N through chemical fertilizers and 25% N through poultry litter was applied. The study conjectured that combination of chemical fertilizers and poultry litter (75:25) proved best in comparison with other integrations and sole applications.
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