氮肥用量及氮、磷、钾配合施用对小米草生长和产量的影响

Effects of N application rates and NPK combined fertilization on hybrid milletgrass growth and yield

在田间条件下研究了氮肥用量及氮(N)、磷(P)、钾(K)单施和配合施用对小米草株高、产量和经济效益的影响。株高结果显示N肥具有明显促进小米草生长的作用,株高随着N肥用量的提高而增加,P肥和K肥对株高的促进作用有限。在P90K120基础上,每公顷施N60、120和180kg分别增加鲜草产量(每公顷产量,下同)10625、18300和21951kg,分别获得纯利润1061、1776和2021元。不同P、K肥配合对N肥效果产生明显影响,分别以不施P、K肥、只施P肥和P、K肥配合施用为基础,N肥施用分别提高小米草鲜草产量12501、15600和18300kg,结果显示N、P、K配合施用效果最好。N、P、K养分间具有明显的正交互作用,N、P肥配合施用对产量的交互值为+3099kg,P、K的配合与N肥间的交互值为+5799kg,说明N、P、K只有配合施用才能充分发挥各种养分的增产作用。

A field trial was carried out in Datonghu Administration District of Jianghan Plain to study the response of hybrid millet ?穴Echinoclen sp.?雪 growth?熏 yield and profit to nitrogen ?穴N?雪 fertilizer rates and NPK combined fertilization. The plant height results showed that N application significantly promoted hybrid millet growth and the height increased followed with N rates raise. However?熏 the effect of P and K increased plant height was limited. Compared to treatment with P2O5 90 kg/hm2 and K2O 120 kg/hm2?熏 hybrid millet fresh yield increased by 10625?18300 and 21951kg/hm2 ?熏 and the profit increased by 1061?熏 1776 and 2021 Yuan/hm2 with N rates 60?熏 120 and 180kg/hm2?熏 respectively. It is showed that P and K fertilization had distinct influence on N effect. Based on no PK?熏 only P?熏 and PK combination?熏 N application improved yield by 12501?熏 15600 and 18300 kg/hm2?熏 respectively. There was positive interaction on yield among N?熏 P and K. The interaction of N and P was +3099kg?熏 and N and PK combination was +5799kg. The results displayed that N?熏 P and K combined application received the best effect among all treatment. It also illustrated that only N?熏 P and K balanced fertilization could each nutrient applied to field take its effect.