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【目的】研究有机肥对石灰性棉田土壤磷素有效性及棉花产量的影响。【方法】选用两种有机肥即风化煤和牛粪,采用混施与单施两种施肥方式进行田间和网袋试验。【结果】在田间和网袋试验中,牛粪与过磷酸钙混施处理后土壤速效磷和全磷含量、棉花产量和地上的吸磷量显著高于其它施肥处理;速效磷在苗期达到最大,分别为44.9和45.2 mg/kg;全磷在蕾期最大,分别为1.115 8和1.165 0 g/kg。棉花产量为4 789 kg/hm2。【结论】无论是单施还是混施,牛粪比风化煤更能较好地增加土壤磷的有效性,这主要是与牛粪有较低的C/P有关。
【Objective】 The objective of this study was to investigate the effects of organic fertilizer on soil phosphorus availability and cotton yield in calcareous cotton fields. 【Method】 Two kinds of organic fertilizer, weathered coal and cow dung, were selected. Field and net bag experiments were carried out by using two kinds of fertilization methods: mixed application and single application. 【Result】 In field and net bag experiments, available phosphorus and total phosphorus, cotton yield and P uptake were significantly higher than those of other fertilizers after mixed application of cow dung and superphosphate; The highest at 44.9 and 45.2 mg / kg, respectively. The highest total phosphorus at the bud stage was 1.115 8 and 1.165 0 g / kg, respectively. Cotton production was 4 789 kg / hm2. 【Conclusion】 Dung manure can increase the availability of soil phosphorus better than weathered coal, which is mainly due to the lower C / P of cow dung.