氮、磷、钾对湿害胁迫下甘蓝型油菜产量的影响

对甘蓝型油菜品种中双10号和中油杂5号苗期进行水淹处理模拟湿害胁迫，运用“3414”肥料效应田间试验方案，研究湿害胁迫下施肥量对油菜产量的影响。结果看出，施氮磷钾肥对湿害胁迫下的油菜产量性状有重要影响。灰色关联分析表明，施氮量与每角粒数、单株角果数和一次分枝数、二次分枝数和主花序长呈显著正相关；施磷量与单株角果数和每角粒数呈显著正相关；施钾量与每角粒数、千粒重和主花序长有呈显著正相关的趋势。湿害胁迫下，保证中等水平的磷肥和钾肥，增施氮肥可显著提高油菜的单产、投产比和经济效益。通过建立肥效与产量间的效应函数方程，在湿害危害严重的油菜种植地区，适宜肥料用量为:N 267 kg/hm2、P2O5 120 kg/hm2、K2O 120 kg/hm2。

Effect of application of nitrogen, phosphorus and potassium fertilizers on yield in rapeseed (Brassica napus L.) under the waterlogging stress

The fluorine in tea has become an important harassment on human health and the development of tea industry. Based on the single factor experiment, a quadratic regression model was established to optimize the removal of fluorine in tea soil by EDTA using orthogonal rotation combination design. The model was expressed as y = 62.92642－6.80471x₁ + 2.85102x₂ +3.74368x₃－6.65557x₁²－4.74638x₄² +2.70625x₁x₄ +2.70625x₂x_3, in which y is the potential removal rate of fluorine in tea soil, x₁ is EDTA density, x₂ is pH, x₃ is SDS dosage, and x₄ is F content in soil. The calculation results from the model showed that when EDTA density is 0.085 mol/L, pH value is 8.9, SDS dosage is 21.70 mL and F content in soil is 650.65 mg/kg, the yield(y) reaches the maximum (71.70％), which was confirmed by the experiment result.