宁夏引黄灌区羊草水肥耦合效应研究

doi:10.11686/cyxb2019364

摘要/Abstract

摘要： 为了研究宁夏引黄灌区水肥耦合对羊草产量、品质及种子产量的影响,以中科2号羊草为研究材料,采用双因素裂区试验设计,主区为水分处理,副区为肥料处理,运用二次多项式逐步回归及归一化方法,寻求满足多目标综合效益最大化的灌水施肥制度。结果表明,灌水对种子和干草的产量、肥料偏生产力(PFP)、灌溉水分利用率(iWUE)和品质均有显著影响(P<0.05);施肥对种子和干草的产量、PFP、品质和干草iWUE有显著影响(P<0.05);水肥交互对千粒重、抽穗率、品质、干草PFP和iWUE均有显著影响(P<0.05)。灌水量为360 mm、施肥量为132 kg·hm^-2时种子产量最高,灌水量为360 mm、施肥量为540 kg·hm^-2时干草产量和相对饲喂价值(RFV)最高。综合分析得出,水肥耦合效应根据羊草生产目的而定。羊草种植以收获干草和饲草品质为目的,可将灌水量定为288~360 mm、施肥量为324~540 kg·hm^-2;羊草种植以收获种子和肥料高效利用为目的,可将灌水量定为288~360 mm、施肥量为108~216 kg·hm^-2。

关键词: 羊草, 水肥耦合, 干草产量, 种子产量, 营养价值

Abstract: This research investigated the effects of water and fertilizer and their interaction on the yield, hay quality and seed yield of Leymus chinensis in the Ningxia irrigation area. The L. chinensis cultivar used was Zhongke No.2. A two factor split-plot experiment design was adopted, with water as the main plot treatment and fertilizer as the sub-plot treatment. A quadratic polynomial stepwise regression and normalization was used to identify the combination of irrigation and fertilizer that best optimized the multi-factor benefit. It was found that irrigation had significant effects on seed and hay yield, fertilizer partial productivity (PFP), irrigation water use efficiency (iWUE), and hay quality (P<0.05). Fertilization had significant effects on seed and hay yield, PFP, quality, and hay iWUE (P<0.05); significant (P<0.05) water fertilizer interactions were observed for thousand-grain weight, heading rate, hay quality, hay PFP and iWUE. The seed yield was highest with 360 mm irrigation and 132 kg·ha^-1 fertilizer application. The hay yield and relative feeding value (RFV) were highest with 360 mm irrigation and 540 kg·ha^-1 fertilizer application. Stepwise analysis showed that the interaction effect of water and fertilizer differs depending on the purpose of L. chinensis cultivation. When L. chinensis is planted for hay production and forage quality is important, the recommendation is to apply 288-360 mm and 324-540 kg·ha^-1 of fertilizer; when L. chinensis is planted for seed production and when efficient use of fertilizer is important, the recommendation is to apply 288-360 mm irrigation and 108-216 kg·ha^-1 of fertilizer.

Key words: Leymus chinensis, coupling of water and fertilizer, hay yield, seed yield, nutritional value

伏兵哲, 周燕飞, 李雪, 倪彪, 高雪芹. 宁夏引黄灌区羊草水肥耦合效应研究[J]. 草业学报, 2020, 29(5): 98-108.

FU Bing-zhe, ZHOU Yan-fei, LI Xue, NI Biao, GAO Xue-qin. Effect of water and fertilizer coupling on Leymus chinensis in the Ningxia irrigation area[J]. Acta Prataculturae Sinica, 2020, 29(5): 98-108.

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