There is immobilization of inorganic P （phosphorus） fertilizer becoming unavailable to plants and declining yield over cropping seasons is occurring in rice agro-ecology of humid forest. The performances of indigeno...There is immobilization of inorganic P （phosphorus） fertilizer becoming unavailable to plants and declining yield over cropping seasons is occurring in rice agro-ecology of humid forest. The performances of indigenous PR （rock phosphates） from Ma （Mali）, Burkina Bu （Faso）, Ni （Niger）, To （Togo） and Senegal including that of Pa （Thies） and Ta （Taiba） were tested applying 200 kg.P2O5.ha-1 and 400 kg.P2O5.ha-1 once for three cropping seasons while TSP （triple super phosphate） was applied every season at 60 kg.P2O5.ha-1 and 120 kg-P2O5.ha-1. No P-fertilizer treatment was the control plot and WAB 56-104 was sown as rice variety. No significant difference was observed between the overall mean values of plant height, tiller and panicle numbers according to P-sources likewise for the grain yield when comparing that of 60 kg.P2O5.ha-1 （TSP） vs. treatments of PR while, the treatments Pa, Ta and To significantly induced greater grain yield than 120 kg.P2O5.ha-1 as TSP. Moreover, declining yield in the third cropping year was greater （75%） with TSP than for To, which was not significantly impacted by the number of cropping seasons. Applying 200 kg.P2O5.ha-1 of To was suggested as strategy for sustaining rice production on Ferralsol of west Africa.展开更多
文摘There is immobilization of inorganic P （phosphorus） fertilizer becoming unavailable to plants and declining yield over cropping seasons is occurring in rice agro-ecology of humid forest. The performances of indigenous PR （rock phosphates） from Ma （Mali）, Burkina Bu （Faso）, Ni （Niger）, To （Togo） and Senegal including that of Pa （Thies） and Ta （Taiba） were tested applying 200 kg.P2O5.ha-1 and 400 kg.P2O5.ha-1 once for three cropping seasons while TSP （triple super phosphate） was applied every season at 60 kg.P2O5.ha-1 and 120 kg-P2O5.ha-1. No P-fertilizer treatment was the control plot and WAB 56-104 was sown as rice variety. No significant difference was observed between the overall mean values of plant height, tiller and panicle numbers according to P-sources likewise for the grain yield when comparing that of 60 kg.P2O5.ha-1 （TSP） vs. treatments of PR while, the treatments Pa, Ta and To significantly induced greater grain yield than 120 kg.P2O5.ha-1 as TSP. Moreover, declining yield in the third cropping year was greater （75%） with TSP than for To, which was not significantly impacted by the number of cropping seasons. Applying 200 kg.P2O5.ha-1 of To was suggested as strategy for sustaining rice production on Ferralsol of west Africa.
