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大葱是生育期较长的百合科蔬菜作物。一般大葱的产量较高,667平方米产3000~6000千克,大葱对氮、磷、钾养分吸收的比例约为1∶0.4∶1.3,由此可见大葱对钾和氮的需求较多,磷次之。所以在施肥的比例上,要注意钾肥的平衡供应问题。全程施肥要分基肥与追肥两部分。基肥中最好667平方米施4000~5000千克腐熟优质有机肥,在整地时撒施地面,耕翻土中。化肥基肥应施入全部磷肥,40%氮肥和60%的硫酸钾肥,品种可选复合肥或单质肥。在选复合肥
Welsh onion is a longer period Liliaceae vegetable crops. General onion yield higher, 667 square meters of 3000 to 6000 kg, green onions nitrogen, phosphorus and potassium nutrient absorption ratio of about 1: 0.4: 1.3, we can see that the demand for potassium and nitrogen onions more, phosphorus It Therefore, the proportion of fertilization, we should pay attention to the balance of supply of potash fertilizer. Fertilizers should be divided into basal fertilizer and dressing two parts. Basal fertilizer in the best 667 square meters applied 4000 ~ 5000 kg of decomposed high-quality organic fertilizer, spreading the ground during land preparation, tilling the soil. Fertilizer base fertilizer should be applied to all the phosphate fertilizer, 40% nitrogen fertilizer and 60% potassium sulfate fertilizer, optional compound fertilizer or elemental fertilizer. Selected compound fertilizer