脐橙氮、磷矿质营养的运转分配规律和座果机制的研究

本试验选择朋娜脐橙（Skagg’sBonanzaNavel），在萌芽期和花芽分化期叶片施用15N硫铵，(32)P磷酸二氢纳和(15)N尿素，研究脐橙在萌芽期、初花期、生理落果期以及花芽分化期氮、磷营养吸收运转分配规律．结果表明开花这个生理过程需消耗大量氮、磷营养．同时在落花落果期，落花落果的(32)P放射比强度和NDFF％都比座果的小，说明，氮磷营养条件是引起脐橙落花落果的主要原因之一．而且，GA3＋BA，GA3激素处理能吸引氮磷营养向幼果运输，此结果与GA3＋BA，GA3处理提高座果率和减少落果率相一致．

THE STUDY ON THE INTERREATION BETWEEN MINERAL DISTRIBUTION AND FRUIT SET BY ~(15)N AND ~(32)P ISOTOPES

The present research was carried out in the condition of plastic greenhouse culture, 15 N - ammonium Sulphate and 32P-Sodium di - hydiogen phosphnate were spiled on the leaves of Skagg's Bonanza Navel It studied the assimilation, translocation characteristics and practical effect after spraying 15N - amomnium Sulphate, 15 N - Urea and 32P - Sodium Di - hydrogen phosphnate. With sprout and leaves were spreed the 15N-Urea absorbed by leaves, branches transolcated to new organs slowly with the characteristic of stored nutrition tO spur leaves and fiuit set in next year. The total Nitrogen, NDFF% and 32P radio sink intensity in the leafy inflorescence were much higher than the leaf less inflorscence, It can explain why the fruit set rate of inflorscence is higher than the leafless inflorscece. During the period of drop, the total Nitrogen,NDFF% and 32P radio sink intensity of set fruit is appers higher than drop fruits, the results showed that it is one of the reasons caused fruit drop of Nitrogen and Phosphorte nutrition lacked. When the young fruit was painted with GA3 BA and GA3 the radio sind intensity, the total Nitrogen and NDFF% in treated fruit were > GA3 > CK. From these results, it is suggested that there was close interaction between CA3 BA, GA3 treatments and enhancement of fruit set rate.