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1.适于棚菜根外追肥的肥料种类对棚菜进行根外追肥,应根据不同蔬菜、不同生育期加以选择。如尿素属速效氮肥,中性,易被作物吸收;过磷酸钙和磷酸二氢钾都是良好的磷、钾肥,且水溶性好,都适于做根外追肥。此外,硫酸钾、磷酸铵、硼酸、硼砂、钼酸铵等化肥,及鸡粪、兔粪的发酵液、草木灰的浸出液也都适于根外追肥。2.棚菜根外追肥的浓度和用量上述肥料可用于黄瓜、番茄、甜椒、茄子、菠菜、菜豆、西葫芦等叶面追肥,其使用浓度和用量分别为:尿素0.3%-0.5%,50-100公斤/亩;磷酸二氢钾0.2%-0.3%,50-60公斤/亩;过磷酸钙1%-2%,50-100公斤/亩;磷酸铵1%,100公斤/亩;硫酸钾
1. Suitable for greenhouse fertilizer outside the top-dressing fertilizer on the greenhouse vegetables, should be based on different vegetables, different growth period to be selected. Such as urea is a quick-acting nitrogen fertilizer, neutral, easily absorbed by crops; superphosphate and potassium dihydrogen phosphate are good phosphorus, potash, and water-soluble, are suitable for root top dressing. In addition, potassium sulfate, ammonium phosphate, boric acid, borax, ammonium molybdate and other fertilizers, and chicken manure, rabbit feces fermentation broth, ash extraction are also suitable for root top dressing. 2. Canopy root top dressing concentration and dosage The above fertilizers can be used for cucumber, tomato, bell pepper, eggplant, spinach, beans, squash and other foliar top dressing, the use of the concentration and dosage were: 0.3% -0.5% urea, 100 kg / acre; potassium dihydrogen phosphate 0.2% -0.3%, 50-60 kg / acre; superphosphate 1% -2%, 50-100 kg / acre; ammonium phosphate 1%, 100 kg / acre;