在桃、油桃品种Maravilha、Sunfed、Rhodes和Hermosa的露红期、盛花期或幼果早期,对单枝或全株喷布不同浓度(0～16％)尿素。定期统计标定枝上的座果数、称重,计算校正疏除的幼果数,并于采收时对成熟果实称重,根据以上数据来评价疏除效果。喷布尿素显著地降低了各品种的座果率,增加了喷布尿素后1～2周时幼果的重量,提高了最后的单果重。按主干横断面积计算的产量没有降低,尤其是Sunred品种喷布16％尿素的处理。Rhodes和Hermosa品种于盛花期比露红期和幼果期对尿素敏感,但Maravilha品种不这样。虽然生殖器官对尿素的敏感性不同,但以上3个时期都可进行喷布。较高浓度(12～16％)的尿素会渗透到未萌发的休眠芽中,从而引起小枝的干枯。(文摘号5498) 译自(英)《园艺学文摘》1988年第58卷第9期译者:吴瑗 Different concentrations (0-16%) of urea were sprayed on single-branch or whole-plant peach and nectarine varieties Maravilha, Sunfed, Rhodes and Hermosa in the early red-opening, full-bloom or early seedling stages. Regular statistical calibration of the number of seats on the branches, weighing, calculating the number of young sparsely adjusted, and in the harvest of mature fruits weighing, based on the above data to evaluate the effects of sparse. Spraying urea significantly reduced the fruit set rate of each variety, increased the weight of young fruit 1 to 2 weeks after spraying urea, and increased the final fruit weight. Yields by trunk cross-sectional area did not decrease, especially with the Sunred variety sprayed with 16% urea. Rhodes and Hermosa cultivars were urea-sensitive at full bloom compared to dew and young fruit, but Maravilha did not. Although reproductive organs of different sensitivity to urea, but the above three periods can be sprayed. Higher concentrations of urea (12-16%) penetrate into the non-germinating dormant buds, causing the branchlets to dry out. (Abstracts No. 5498) translated from (British) “Horticulture Abstracts” Volume 58, No. 9, 1988 Translator: Wu 瑗