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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 ,而块根中其分配比例在块根快速膨大期后则呈现迅速增大态势
The study on the law of fertilizer-absorption of high-yield sweet potato in dry land shows that under the condition of 4 9.8 t / hm2 of fresh potato production, the production of 100 kg of fresh potato requires N0.54kg, P2O50.09kg, K2O0.62kg, 1: 0.16: 1.15. The peak of nitrogen uptake was synchronized with the stem and leaf in the long term, and the absorption intensity was 2.337 kg / (hm2 · d). The peak of phosphorus and potassium uptake was rapid expansion in roots with absorption intensity of 0.479 and 3.0 83 kg / (hm2 · d), the emergence time was late, the accumulation of higher daily duration was longer, and the absorption intensity of potassium> nitrogen> phosphorus; the distribution ratio of nitrogen, phosphorus and potassium in stems and leaves was higher in early growth period, Rapid expansion after rapid decline, while the proportion of roots in the distribution of roots in the rapid expansion period after the rapid increase