【摘要】 <正> 碳酸氢铵(简称碳铵)是我国农业生产上的主要氮肥品种,约占氮肥总用量的55％,对促进我国农业生产起很大的作用,但碳铵具有易挥发,肥效差等缺点,为了使碳铵得到合理的施用,我们在1982年研究的基础上,1983年着重比较碳铵粉剂和粒剂的试验效果。更多还原

【Abstract】 It was indicated in this experiment that the yields of the rice after using of 5.5, 7.5, 9.5 and 11.5 kg. N/mu of (NH4)HCO3 were 138.9, 206.1, 220.6 and 270.6 kg/mu respectively. They are higher than control. There was no significant difference for yields of rice between the using of 9.5 and 11.5 kg/mu. It was shown in the pot experiment that percent utilization of fertilizer was increased with nitrogen applied. By the same amount of nitrogen applied, phosphorous fertilizer abled to promote nitrogen uptaken and yield of rice. It was found that the N to P2O5 ratio of 19:9.5 was optimal for the Lu-tai Farm. There is no significant difference of yield of rice and percent utilization of fertilizer between (NH4)HCO3 and Ca(H2PO4)2. The yield of rice is 10% higher for NH4HCOa in whole ploughing layer base dressing than top dressing.更多还原