|Title:||柑桔園施肥試驗－（第二報）||Other Titles:||Field Experiment of Fertilizer Application in Citrus Orchard||Authors:||邱再發
|Issue Date:||1-Sep-1960||Publisher:||農業試驗所||Journal Volume:||9||Journal Issue:||3||Start page/Pages:||1-8||Source:||農業研究||Abstract:||
The field experiments were carried out in January, 1958 in three localities at Hsinpu town and Yuanlin town, where are famous Prnkan producing centers in Taiwan. Five treatments i. e. a) PK, b) NK c) NP, d) NPK, e) NPK+Mg, Mn, Zn in four to five replications were laid out using randomized block to ascertain the effect of three elements as well as the trace elements upon the fruit yields and the nutrient contents in citrus leaves. The result obtained in the second year trial are as follows;
1) The effect of fertilizer treatments upon the yields showed significant difference in the second year and the effect of each element became an order as N>K>P> Trace Elements. The average fruit yields per tree in three localities is as follows;
2) The trace element plot at two localities in Hsinpu area (Chawmen and Taping) appeared favourable effect on fruit yield and growth condition of trees in comparison with the check plot. Profound studies will be needed to detect what kind of trace element may be deficient in this orchard.
3) The N, P and K contents in the leaf samples taken from all the experimental plots at different seasons were analyzed and it was found that concentration of NPK were high in new leaves in spring season, then decreased gradually following maturity of leaves.
The leaves in the No N plot was found low in nitrogen content significantly as compared with other plots. The critical percentage of nitrogen seems to be at about 3%.
Each P and K content in leaves at No P plot and No K plot revealed a little lower in comparison with that of Check plot, but P and K content at No N plot showed apparently higher, so that nitrogen deficiency would be considered to promote the accumulation of P and K in citrus leaves.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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