论文部分内容阅读
1994~1997年在江苏省泰兴市进行了银杏植株养分分析、施肥现状调研、肥料配方筛选和有机复合肥效果验证。结果显示:①银杏叶片生长高峰期出现在5月20日至6月19日,叶片中氮、磷、钾含量均呈逐渐下降趋势;②果实干重增长率的高峰期出现在6月19日至7月20日,果实中氮素、磷素在8月下旬出现一次低峰,钾素在7月中、下旬出现一次低峰;③银杏中氮素和钾素施入量与收获带走量相比仍显不足,其中氮素亏缺高达50%左右,钾素亏缺亦达30%左右,而磷素盈余近200%;④连续3年筛选出的有机复合肥配方对银杏有良好的增产效果,3年中单株树最低增产白果5%以上,1997年平均增产白果12.8%。
1994 to 1997 in Taixing, Jiangsu Province, ginkgo plant nutrient analysis, fertilizer status investigation, fertilizer formula screening and organic compound fertilizer effect verification. The results showed that: (1) The peak of Ginkgo biloba leaves appeared from May 20 to June 19, and the contents of N, P and K in the leaves tended to decrease gradually. (2) The peak of fruit dry weight growth appeared on June 19 By July 20, there was a low peak of nitrogen and phosphorus in the late August and a low peak of potassium in mid-July and late July. The amount and harvest of nitrogen and potassium in ginkgo Compared with the amount of still insufficient, of which nitrogen deficiency as high as about 50%, potassium deficiency also reached about 30%, while the phosphorus surplus of nearly 200%; ④ three consecutive years of screening of organic compound fertilizer formulations have good ginkgo The results showed that the minimum tree yield per plant in three years was more than 5%, and the average increase was 12.8% in 1997.