|Title:||番石榴之營養及肥培管理||Other Titles:||Nutrition and Fertilization of Guava (Psidium guajava L.)||Authors:||陳敏祥
|Issue Date:||Apr-1989||Publisher:||臺中區農業改良場||Start page/Pages:||135-144||Source:||果樹營養與果園土壤管理研討會專集||Conference:||果樹營養與果園土壤管理研討會
Proceedings of a Symposium on Fruit Tree Nutrition and Orchard Soil Management
As the root system of guava is shallow, yield and fruit quality of guava are strongly influenced by fertilization management. Leaf analysis results indicated that increasing the P supply through foliar application would gradually increased the leaf P content, but had no effect on N and K contents. The seasonal variation study on the concentration of N, P, K and dry matter showed that for each constituent two peaks was observed, one before growth commencement and the other after growth cessation. The lowest concentrations was found after full fruit maturity. Therefore, superphosphate application is recommended when there is an apparent increase in yield. The N, P, and K contents of guava leaves decreased as the leaf age increased. Terminal leaves had more N, P, K, Ca and Mg than basal leaves. Non-fruiting branches had more P and K than fruiting ones. The preliminary data indicated that Ca was related to the firmness of fruits and blossom-end rot of mature fruits. In Hawaii, leaf calcium level of more than 1.25 % is standardized for preventing the above-mentioned problems. Hight exchangeable sodium percentage in soil usually causes nutrient imbalance in guava.
|Appears in Collections:||(1)熱帶果樹系|
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