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引言 春季低产已成为部分亚热带国家和地区发展鸡蛋果生产之重大障碍。由于花芽自幼嫩叶腋间萌出,座果率与营养生长密切相关。营养生长一旦受阻必然导致减产。引起鸡蛋果冬季营养生长减缓和春季低产之可能因素有:光周短,缺水,气温低,以及土温低而降低氮素吸收率等。昆士兰果农曾给鸡蛋果叶面喷施尿素,结果各异。 本文研究冬季叶面喷氮对鸡蛋果植株生长、含氮量及产果量之影响。 材料 与方法 本试验在澳大利亚 Nambour(南纬27°)进行,试材为1.5龄鸡蛋果蔓。株行距4 ×2米(相当于1250株/公顷)。试验地为肥沃砂壤土。年降雨量1779mm(其中夏季雨量占70％),年均蒸发量1516mm。7月份平均最低气温6.9℃,12月份平均最高气温28.7 ℃。20cm深土层温度为14℃(7月)和27℃(12月)。
Introduction Low yield in spring has become a major obstacle in the development of egg and fruit production in some sub-tropical countries and regions. Fruit buds are closely related to vegetative growth due to the eruption of flower buds from young axillary axils. Once the growth of vegetative growth will inevitably lead to reduced production. Egg winter fruit growth retardation and low yield in spring may have factors: short photoperiod, water shortages, low temperature, and low soil temperature and reduce nitrogen absorption rate. Queensland farmers have given urea spray foliar urea, the results vary. In this paper, the effects of winter foliar spray on the growth, nitrogen content and fruit yield of eggplant were studied. Materials and Methods The test was conducted in Nambour, Australia (latitude 27 °). The test material was 1.5-year old egg cranberry. Plant spacing 4 × 2 meters (equivalent to 1250 plants / hectare). Test for the fertile sandy loam. Annual rainfall of 1779mm (of which 70% of summer rainfall), the average annual evaporation 1516mm. July average minimum temperature of 6.9 ℃, December average maximum temperature of 28.7 ℃. The 20 cm deep soil temperature was 14 ° C (July) and 27 ° C (December).