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关于氮肥对无性系RRIM600、PB260、PB235的开花结果和PB330开花的影响,进行一次大田调查,这次调查研究是在现存的三年生幼树肥料试验区进行的,用目测方式统计了树上的开花结果枝、花序和果实的数量,还采收了一些果实。以高于迄今推荐的施肥量对胶树重施氮肥,通常可促进幼树开花。通过测定开花树的频率,每株树的花枝和花序数量来测定开花密度,一般来说,开花密度是增加的,与PB260相比较,这种效应对迟花的无性系如RRIM600更显著,重施氮肥还有促进早花的自然趋势。
A field survey was conducted on the effects of nitrogen fertilizer on the flowering of the clones RRIM600, PB260 and PB235 and on the flowering of PB330. The survey was conducted in the existing triennial study area of saplings and fertilizers. The flowering branches, inflorescences and fruit numbers also harvested some fruit. Nitrogen fertilization of gum trees at higher rates than hitherto recommended can generally promote flowering of saplings. Flowering density was determined by measuring the frequency of flowering trees, the number of flowering branches and inflorescences per tree, and, in general, the flowering density was increased. Compared with PB260, this effect was more pronounced for late flowering clones such as RRIM600, Nitrogen fertilizer also promotes the natural tendency of early flowering.