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幼龄番石榴存在着低产、不稳产问题,并且幼龄树、成龄树的开花期和结果期都很长.将掺有润湿剂的25%的尿素溶液喷洒到15月龄的番石榴实生树(GA9-E×39品种)上,其产量比22月龄的对照株提高了两倍多,而且收获期从对照的15个星期缩短为4个星期.处理株的平均产量为34.69公斤/株,以每公顷805株的种植密度推算,则产量达27.93吨/公顷,对照株的产量仅10.85公斤/株,即8.73吨/公顷.处理株的产量超过了国外同品种、相近树龄植株的产量.果实的大小不受处理影响.在第二年(12个月后)仍用尿素喷洒诱导,产量比第一年提高40%.喷洒尿素作为脱叶剂能使密植的番石榴幼龄树果园提早进入投产期,加速资金周转,能缩短收获期,降低劳动成本,而且还是减轻果蝇为害的经济有效的方法.
Young guava has low yield and instability problems, and young trees and mature trees have long flowering and fruiting periods.A 25% urea solution mixed with wetting agent is sprayed onto 15-month-old guava The yield of the live tree (GA9-E × 39) was more than double that of the control at 22 months, and the harvest was reduced from 15 weeks of the control to 4 weeks.The average yield of the treated plants was 34.69 kg / Plant, calculated according to the plant density of 805 plants per hectare, the output reached 27.93 tons / hectare and that of the control plant was only 10.85 kg / plant or 8.73 tons / hectare. The output of the treated plants exceeded that of the same species and similar age plants The fruit size was unaffected by treatment, with urea spraying still being induced in the second year (after 12 months), yielding a 40% increase over the first year. Spraying urea as a defoliants resulted in close planting of guava juveniles Early arrival of tree orchards into production will speed up cash flow, shorten the harvest period and reduce labor costs, and will also be a cost-effective way to reduce the damage caused by fruit flies.