叶面施硼矫正杨梅缺硼的研究

杨梅Myrica rubra是对硼最敏感的果树之一。叶面施硼是矫正果树缺硼最有效的方法。试验结果表明．杨梅叶面施硼不但可以促进杨梅春夏梢的发生，而且还能显著增加果实产量，提高果实品质。叶面施硼的最佳时间在花前或盛花期。不同施硼方法对当年杨梅的枝梢生长、坐果率及产量的影响，以土施加叶面喷施最好，叶面喷施其次，土施最差。与单喷施硼砂溶液相比，在硼砂溶液中加入尿素或尿素和磷酸二氢钾，不但可以增加杨梅对硼的吸收，而且增强硼肥的增产效应。表5参18

Foliar-applied boron (B) to prevent B-deficiency in red bayberry (Myrica rubra)

Red bayberry （Myrica rubra）, a fruit tree, is very sensitive to boron （B ）-deficiency. Three trials were conducted in Zhejiang Province to study the response of red bayberry to foliar B application and to determine the optimum period of application. Treatments included application to： soil ＋ foliar B, foliar B, and soil; foliar-applied： 1） B and B plus： 2） urea, or 3）, urea and KH2PO4; and timing of the spray： autumn（5 August of 2002）, before blossoming（5 March of 2003） or full flowering day（20 April of 2003）. Each treatment had four replications. After treatment, fruit setting rate, fruit weight, length of branch sprouted ＇in spring, concentration of N, P, K, and B in leaf were determined. Results showed that foliarapplied B not only significantly（P〈0.05） improved sprouting of spring and summer shoots, but also significantly （P〈0.05） increased fruit yield and improved fruit quality. Different B applications on fruit yield and quality of red bayberry showed： soil application ＋ foliar B application 〉 foliar B application 〉 soil application. Urea or urea ＋ KHzPO, added to a foliar B application not only significantly （P〈0.05） increased tree uptake of B, but also significantly （P〈0.05） increased yield. Overall, foliar-applied B was found to be an effective method to correct B-deficiency of fruit trees with the optimum growth stage （before blossoming or full flowering days） for application being at full bloom. Ch, 5 tab. 18 ref.]