太行山低山丘陵区旱作甘薯吸肥规律研究

Study on the Law of Assimilating Fertilizer of Dry Farming Sweet Potato in Low Hills Region of Taihang Mountain

旱作高产甘薯吸肥规律研究表明 ,鲜薯产量 4 9.8t/hm2 水平下 ,每生产 10 0kg鲜薯需N0 .5 4kg ,P2 O50 .0 9kg ,K2 O 0 .6 2kg ,氮磷钾比例 1∶0 .16∶1.15 ;氮吸收高峰与茎叶盛长期同步 ,吸收强度为 2 .337kg/(hm2 ·d) ,磷钾吸收高峰在块根快速膨大期 ,吸收强度分别为 0 .4 79和 3.0 83kg/(hm2 ·d) ,出现时间较晚 ,较高日积累量持续时间较长 ,吸收强度钾 >氮 >磷 ;生育前期氮、磷、钾在茎叶中分配比例较高 ,至块根快速膨大期以后迅速下降 。

The research of law of assimilating fertilizer of high yield sweet protato showed that in 4 98 t/hm 2 freshing sweet potato yield level, freshing sweet potato yield of 100 kilogram required to absorb 0.54kg N, 0.09 kg P 2O 5 and 0.62kg K 2O,and the absorbed ratio of nitrogen,phsphorus,and potassium were 1∶0.16∶ 1.15 respectively. The absorption peak of nitrogen was synchronous with the vigorous growing period of stem and leaf ,and the absorption intensity was 2.337kg/(hm 2·d). The absorption peaks of phsphorus and potassium all appeared in quick expanding period of root tuber,and the aborption intensity were 0.479 and 3.083 kg/(hm 2·d) respectively. The occurence of absorption peak of phsphorus and potassium was later, but lasting longer. In early period of growth,the distribution ratio of nitrogen,phsphorus and potassium in stem and leaf were higher, but rapidly decreased after the expanding period of root tuber. However, this distribution ratio in root tuber rapidly increased.