作物学报 ›› 2018, Vol. 44 ›› Issue (7): 1055-1066.doi: 10.3724/SP.J.1006.2018.01055
陈雪娇1,2,张旭东1,2,韩治中1,2,张鹏1,2,贾志宽1,2,连延浩1,韩清芳1,2,*
Xue-Jiao CHEN1,2,Xu-Dong ZHANG1,2,Zhi-Zhong HAN1,2,Peng ZHANG1,2,Zhi-Kuan JIA1,2,Yan-Hao LIAN1,Qing-Fang HAN1,2,*
摘要:
研究沟垄集雨种植施肥水平对谷子生长的影响及其对产量的贡献, 为完善集雨种植技术理论体系及半干旱区谷子的合理施肥提供科学依据。在宁南旱农区进行了2个年型的二因素大田试验, 研究了沟垄半覆膜集雨(R)和传统裸地平作(T) 2种种植模式下4个施肥水平(高量N 270 kg hm -2 + P2O5 180 kg hm -2, H; 中量N 180 kg hm -2 + P2O5120 kg hm -2, M; 低量N 90 kg hm -2 + P2O5 60 kg hm -2, L; 不施肥对照, CK)对谷子株高、叶面积、光合指标、干物质积累量和水肥利用效率的影响, 并分析了集雨模式下的增产贡献来源。结果表明: (1)集雨模式有效促进了边行谷子光合生理和生长, 在各施肥水平下谷子株高、顶三叶叶面积、Pn (净光合速率)、Tr (蒸腾速率)和生物量较平作模式分别提高7.1%~23.5%、1.7%~22.7%、10.4%~20.3%、8.0%~55.9%和9.8%~30.0%; 中行各指标较平作模式均下降不显著。(2)集雨种植模式显著提高了谷子的水肥利用效率, 配施氮磷肥水分利用效率显著增加, 在丰水年高肥处理显著高于中、低肥处理, 欠水年中肥处理最高且显著高于高肥处理, 与低肥处理差异不显著; 肥料利用效率随着施肥量的增加而下降, 在丰水年低肥处理的肥料利用率显著大于高肥和中肥处理, 欠水年各施肥水平间差异显著。(3)施肥对谷子的增产贡献大于种植模式。施肥对产量的贡献率在丰水年随施肥量的增加而增加, 高、中、低施肥处理间差异显著, 达27.8%~49.3%, 欠水年各施肥处理间差异不显著(19.2%~23.7%); 种植模式贡献率在2年中各施肥处理间差异均不显著。综合考虑, 集雨模式在丰水年施高肥、欠水年施中肥可实现谷子高产高效生产。
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