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一、柑桔在不同时期养分的吸收量 关于施肥养分的吸收,与地温和气温等温度条件、土壤水分及土壤通气状况有关。尤其在气温高的夏季,也是桔树生长量最高时期,矿质养分的吸收量也达到一年内的高峰期。在成龄树中,氮磷钾三要素在夏季的吸收速度都达到最大值,且钾的吸收速度高于氮的吸收速度。 在同等条件下,桔树施入的春、夏、秋肥中,施肥量最高的春肥(67.5克)未被吸收利用的氮素竟达52克。 在该试验中,春、夏、秋肥的施肥比例分别为45％、20％和35％。因此,象这样以春肥为重点的施肥体系中,春季没有被吸收
First, citrus absorption of nutrients at different times on the absorption of fertilizers, and temperature and temperature and other temperature conditions, soil moisture and soil aeration conditions. Especially in the hot summer, but also the highest growth of orange trees, the absorption of mineral nutrients also reached the peak of one year. In mature trees, the three elements of N, P, and K reached the maximum in summer, and the absorption rate of potassium was higher than that of nitrogen. Under the same conditions, among the spring, summer and autumn manure applied with orange trees, the spring spring fertilizer (67.5 g) with the highest fertilizer amount did not absorb as much as 52 g of nitrogen. In this experiment, the proportion of spring, summer and autumn fertilizer fertilization were 45%, 20% and 35% respectively. Therefore, spring fertilization systems like this are not absorbed in spring