花生是一种需氮肥较多的作物。每生产100公斤荚果需纯氮5公斤左右,是玉米的2倍。虽然花生根部象其他豆科作物一样,有根瘤菌共生,能固定空气中的氮素,但这种固氮能力毕竟有限,其固氮量远远不能满足花生需求,相当一部分氮素还得从土壤中吸收。所以,种植花生时,也应施用速效氮肥,尤其应注意对瘠薄地施氮。实践证明,只要施氮得当,一般可增产10%以上。那么,怎样合理地给花生施氮肥呢?具体来说。必须处理好五个关系,即“五要五不要”。 Peanut is a crop that needs more nitrogen fertilizer. Per 100 kg of pods required about 5 kg of pure nitrogen, which is 2 times that of corn. Although peanut root, like other leguminous crops, has Rhizobium symbiosis, which can fix the nitrogen in the air, this nitrogen fixing ability is limited after all. Its nitrogen fixation can not meet the demand of peanut. A considerable part of nitrogen has to be removed from the soil absorb. Therefore, the planting of peanuts, it should also be applied quick-acting nitrogen fertilizer, with particular attention to infertile nitrogen. Practice has proved that, as long as nitrogen is appropriate, the general increase of more than 10%. So, how to rationally fertilize peanuts? Specifically. Five relations must be handled, that is, “five must be five not.”