向日葵是我县新型的下茬复种油料作物。经1975、1976年两年多点小面积试种,到1977—1978年扩大到6.9—12万亩,平均亩产70斤,最高亩产达到400斤。为了摸索向日葵的需肥规律,掌握向日葵的施肥技术,全县各级农科组织在大面积生产中认真研究向日葵的需肥量和施肥方法,其试验结果综合如下:一、氮、磷、钾肥的增产作用向日葵是需肥量较多、吸收力 Sunflower is a new type of crop in the county under the crop. After more than two years of small-scale trial planting in 1975 and 1976, it was expanded to 6.9-12 million mu from 1977 to 1978, with an average yield of 70 kg per mu and a maximum of 400 kg per mu. In order to explore the law of sunflower need to master the sunflower fertilizer technology, the county agricultural organizations at all levels in a large area of ​​production of sunflower required fertilizer and fertilizer methods, the test results are summarized as follows: First, nitrogen, phosphorus and potassium The sunflower yield increase is required more fertilizer, absorption