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为促进盐碱地棉花苗期生长和增产,通过田间试验研究了不同施磷方式对棉花苗期生长、氮磷养分吸收和产量的影响。结果表明,施用等量磷(P2O5)的条件下,随棉花出苗水滴施磷肥能显著促进棉花苗期生长、养分吸收和增产。随出苗水滴施30kg·hm-2磷酸二氢钾的棉花蕾数和生物量分别比对照增加84.6%和50.0%,氮、磷吸收量分别增加21.2%和20.4%,可增产6.2%。滴施60kg·hm-2磷酸二氢钾的棉花蕾数和生物量分别增加115.4%和75.0%,氮、磷吸收量分别增加75.1%和71.1%,可增产15.2%。
In order to promote the seedling growth and yield increase of saline-alkali cotton, the effects of different phosphorus application methods on cotton seedling growth, nutrient uptake and yield of nitrogen and phosphorus were studied through field experiments. The results showed that under the condition of the same amount of phosphorus (P2O5), the application of phosphorus fertilizer with cotton seedling could significantly promote cotton seedling growth, nutrient uptake and yield. The numbers of buds and biomass of cotton buds with 30 kg · hm-2 potassium dihydrogen phosphate increased by 84.6% and 50.0% respectively compared with the control. The uptake of nitrogen and phosphorus increased by 21.2% and 20.4%, respectively, with an increase of 6.2%. The numbers of buds and biomass of cotton buds treated with 60 kg · hm-2 of potassium dihydrogenphosphate increased by 115.4% and 75.0%, respectively, and the uptake of nitrogen and phosphorus increased by 75.1% and 71.1% respectively, which increased 15.2%.