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一年中究竟哪个时期是落叶果树氮素肥料NO_3~-利用率最高时期仍然是一个争论问题,而肥料是在树体对NO_3~-吸收能力没有充分认识的情况下使用的。许多田间试验都没有肯定的结果,因为有效氮被微生物矿化的过程随着夏季温度的增高而增强,结果有效氮的变动可能超过了处理间的差异。此外,灌溉、果园管理、土壤类型以及氮的载体都影响所施N的运
Which period of the year is deciduous tree nitrogen fertilizer NO 3 ~ - the highest period of utilization is still a controversial issue, and the fertilizer is in the tree of NO_3 ~ - Absorption capacity is not fully aware of the circumstances. Many field trials have shown no positive results because the process of mineralization of available nitrogen by microorganisms increases with increasing summer temperatures, with the result that the change in available nitrogen may outweigh the differences between treatments. In addition, irrigation, management of orchards, soil types, and nitrogen carriers all affect the N transport applied