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根据灰潮土土壤特征,采取针对性的施肥方式,对灰潮土的培肥改良及其农作物的均衡增产具有明显的功效。结果表明:与习惯施肥相比,增施沼渣15 t/hm2,土壤有机质增加0.3 g/kg,全氮增加0.02 g/kg,速效磷增加1.1 mg/kg,速效钾增加2 mg/kg;运用函数效应法,确定氮磷钾比例及其相应的施肥量,皮棉产量达1 537.05 kg/hm2;坚持因土因植制宜,酌施硫硼肥,对平衡土壤硫硼营养及油菜等作物生长发育、产量的形成均有积极作用;试验同时表明,与习惯施肥相比,配施膨润土1 125 kg/hm2,小白菜镉含量减少0.02 mg/kg,提高了小白菜的食用安全性。
According to the characteristics of soil in gray soil, the targeted fertilization method has obvious effect on the improvement of fertility improvement and the balanced increase of crops in gray soil. The results showed that compared with the conventional fertilization, the increase of biogas residue was 15 t / hm2, the soil organic matter was increased by 0.3 g / kg, the total nitrogen was increased by 0.02 g / kg, the available phosphorus was increased by 1.1 mg / kg and the available potassium was increased by 2 mg / kg. Using the function effect method, the proportion of NPK and its corresponding fertilizers were determined, and the lint yield reached 1 537.05 kg / hm2; Growth and development and yield formation. At the same time, the experiment also showed that compared with conventional fertilization, with the application of bentonite at 1 125 kg / hm2, the cadmium content in Chinese cabbage decreased by 0.02 mg / kg, which improved the food safety of Chinese cabbage.