浙江金衢盆地油菜施磷的农学经济效益和磷用量研究

Studies on agronomic and economic effects for rapeseed fertilized with P and P rate in Jinhua-Juzhou basin of Zhejiang province:

本文系统地研究了浙江金衢盆地油菜施磷的农学和经济效益，油菜的磷吸收和分配特点以及磷的适宜用量。２２个油菜试验施磷平均增产８８．６ｋｇ／亩（１亩≈６６７ｍ２），比对照增产２０２．７％。每亩净增利润２１５．８元，产投比为６．７６。亩施入１ｋｇＰ２Ｏ５可产出油菜籽９．４５ｋｇ。油菜平均吸收Ｐ２Ｏ５为２．７０ｋｇ／亩，其中吸收的磷大部分分布在籽粒中。不同试验点磷利用率变化较大，变幅在３．７３～３７．７％之间，平均为２１．５％。油菜的Ｐ２Ｏ５用量大约在１０ｋｇ／亩左右。

This paper studied systematically on the agronomic and economic effects of rapeseed fertilized with P, the absorption and distribution characters, and the suitable P rate of rapeseed. Results of the 22 rapeseed field experiments fertilized with P showed that an average yield increased by 88.6 kg/mu (1mu≈667m 2 ) or increased by 202.7%. The ratio of output to input was 6.76 and the rapeseed yield increased by using 1 kg P 2 O 5 was 9.45 kg. The average amount of P uptaken by rapeseed plants was 2.70 kg/mu, most of which distributed in the grains. The P ultilization rate by rapeseed varied greatly in different soils, ranged from 3.73% to 37.7% and a average of 21.5%. The suitable rate of P 2 O 5 was 10 kg/mu.