Phosphorus is crucial to crop growth and yield because of its multiple effects on plant nutrition. Most tropical soils have low plant available phosphorus and there is the need for external input of P to achieve optim...Phosphorus is crucial to crop growth and yield because of its multiple effects on plant nutrition. Most tropical soils have low plant available phosphorus and there is the need for external input of P to achieve optimum yield. The response of soybean to different sources and levels of phosphorus fertilization were therefore investigated between August, 2013 and January, 2014. The treatments consisted of four fertilizer sources [Sokoto Rock Phosphate （SRP）, single super phosphate, Di-Ammonium Phosphate （DAP） and control] and five levels of fertilizers （0, 15, 30, 60 and 75 kg P· hm-2） fitted into Randomized Complete Block Design （RCBD） with three replications. Soil samples were collected, processed and analyzed before planting and after harvest. Data on growth （plants height, numbers of leaves, numbers of branches and numbers of flowers） and yield （pod and grain weights） were analyzed using ANOVA and significant means were separated using LSD at 5% probability level. Application of DAP at 15 kg P· hm2 and 30 kg P· hm2 produced the highest grain yield and showed significant differences in plant height, numbers of leaves and numbers of branches. SRP should not be recommended for the study area, because there was no significant difference across all the parameters and it was characterized with low grain yield, due to its level of acidity and the mildly acidic nature of the soil.展开更多
文摘Phosphorus is crucial to crop growth and yield because of its multiple effects on plant nutrition. Most tropical soils have low plant available phosphorus and there is the need for external input of P to achieve optimum yield. The response of soybean to different sources and levels of phosphorus fertilization were therefore investigated between August, 2013 and January, 2014. The treatments consisted of four fertilizer sources [Sokoto Rock Phosphate （SRP）, single super phosphate, Di-Ammonium Phosphate （DAP） and control] and five levels of fertilizers （0, 15, 30, 60 and 75 kg P· hm-2） fitted into Randomized Complete Block Design （RCBD） with three replications. Soil samples were collected, processed and analyzed before planting and after harvest. Data on growth （plants height, numbers of leaves, numbers of branches and numbers of flowers） and yield （pod and grain weights） were analyzed using ANOVA and significant means were separated using LSD at 5% probability level. Application of DAP at 15 kg P· hm2 and 30 kg P· hm2 produced the highest grain yield and showed significant differences in plant height, numbers of leaves and numbers of branches. SRP should not be recommended for the study area, because there was no significant difference across all the parameters and it was characterized with low grain yield, due to its level of acidity and the mildly acidic nature of the soil.
