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草业学报 ›› 2025, Vol. 34 ›› Issue (4): 38-52.DOI: 10.11686/cyxb2024207

• 研究论文 • 上一篇    下一篇

氮肥周年优化对灌区饲用小黑麦-青贮玉米复种系统生产力的影响

张晓娟1,2(), 魏娇娇3, 陈彩锦2, 李雪雪3, 马宏秀1, 李凯2, 陈永伟4, 孙权3()   

  1. 1.宁夏大学林业与草业学院,宁夏 银川 750021
    2.宁夏农林科学院固原分院,宁夏 固原 756000
    3.宁夏大学农学院,宁夏 银川 750021
    4.宁夏农垦农林牧技术推广服务中心,宁夏 银川 750021
  • 收稿日期:2024-06-03 修回日期:2024-07-25 出版日期:2025-04-20 发布日期:2025-02-19
  • 通讯作者: 孙权
  • 作者简介:Corresponding author. E-mail: sun_q@nxu.edu.cn
    张晓娟(1987-),女,宁夏固原人,助理研究员,在读博士。E-mail: elizabeth2006love@163.com
  • 基金资助:
    宁夏自然科学基金资助项目(2023AAC03441);宁夏大学校地合作科技示范项目《麦属饲草-青贮玉米一年两熟水肥一体化高产高效栽培技术研究与示范》(NXXDHZ202316)

Optimization of annual nitrogen fertilizer application to increase the productivity of a forage triticale-silage maize multiple cropping system in an irrigated area

Xiao-juan ZHANG1,2(), Jiao-jiao WEI3, Cai-jin CHEN2, Xue-xue LI3, Hong-xiu MA1, Kai LI2, Yong-wei CHEN4, Quan SUN3()   

  1. 1.College of Forestry and Prataculture,Ningxia University,Yinchuan 750021,China
    2.Guyuan Branch,Ningxia Academy of Agriculture and Forestry Sciences,Guyuan 756000,China
    3.College of Agriculture,Ningxia University,Yinchuan 750021,China
    4.Ningxia Agricultural Reclamation Agriculture,Forestry and Animal Husbandry Technology Popularizing Service Center,Yinchuan 750021,China
  • Received:2024-06-03 Revised:2024-07-25 Online:2025-04-20 Published:2025-02-19
  • Contact: Quan SUN

摘要:

为了缓解宁夏季节性青饲料短缺和氮肥施用过量等草畜发展不平衡现状。开展秋播饲用小黑麦-青贮玉米复种模式及其周年氮肥合理施用研究,采用单因素随机区组设计,以秋播饲用小黑麦-青贮玉米复种系统为研究对象,设置5个周年优化施氮量,均为纯氮水平(单位为kg?hm-2),分别为N1(0 kg?hm-2,CK)、N2(150 kg?hm-2)、N3(300 kg?hm-2)、N4(450 kg?hm-2)、N5(600 kg?hm-2),系统研究氮肥周年优化对复种系统生产性能、营养品质及氮素利用率的影响。结果表明:氮肥周年优化施氮量对复种系统两种饲草株高、茎粗、SPAD值、干物质积累、产量和品质均有显著性影响。其中,两种饲草生长指标和干物质积累随着生育期的延长逐渐增大,小黑麦在开花期,青贮玉米在灌浆期各生长指标和干物质积累达到峰值,而随着施氮量的增加生长指标和干物质积累呈先升高后降低的趋势,但在N4水平时呈下降趋势,整体表现为N4>N5>N3>N2>N1;复种系统鲜草产量随着周年施氮量的增加呈逐渐增加的趋势,N5水平时产量最大,为156.8 t?hm-2,比对照增产61.3%,干草产量随周年施氮量的增加呈先增加后降低的趋势,N4水平时产量最大,为39.1 t?hm-2,比对照增产45.9%,农学利用效率最高为30.2%;复种系统鲜草产量与青贮玉米鲜草产量显著正相关,干草产量与小黑麦干草产量极显著正相关,复种系统氮素利用率与青贮玉米中性洗涤纤维(NDF)极显著正相关,与酸性洗涤纤维(ADF)显著正相关。优化施氮量对饲草营养品质有显著影响,N4水平下各营养指标表现最好,显著提高了饲用小黑麦、青贮玉米和复种系统粗蛋白(CP)和粗脂肪(EE)含量,其中,小黑麦、青贮玉米和复种系统CP含量比对照分别提高了33.7%、11.2%和31.8%,显著降低了ADF和NDF含量;经肥料效应方程模拟得出,宁夏引黄灌区饲用小黑麦-青贮玉米饲草复种系统最高产量施肥量为560 kg?hm-2,最佳经济效益施肥量为584 kg?hm-2,可为灌区饲草复种科学栽培提供理论依据。

关键词: 氮肥周年优化, 灌区, 饲草, 复种系统, 生产力

Abstract:

At present, there is a shortage of seasonal green feed in Ningxia, despite the excessive application of nitrogen fertilizer. This situation is indicative of an imbalance between grassland and livestock development in this region. To address this issue, we explored the suitability of a multiple cropping model of forage triticale-silage maize for autumn sowing with different levels of nitrogen fertilizer applied annually. The experiment had a single factor randomized block design. Triticale and silage maize were sown in autumn and subjected to five different fertilization treatments, namely N1 (0 kg?ha-1, CK), N2 (150 kg?ha-1), N3 (300 kg?ha-1), N4 (450 kg?ha-1), and N5 (600 kg?ha-1). The effects of these fertilization treatments on the performance, nutrient quality, and nitrogen-use efficiency of the multiple cropping system were determined. The results showed that the annual nitrogen application rate had significant effects on the plant height, stem diameter, chlorophyll content (measured as SPAD value), dry matter accumulation, yield, and quality of triticale and maize in the multiple cropping system. The growth indexes and dry matter accumulation of both triticale and maize gradually increased during the growth period, reaching peak values in triticale at the flowering stage, and in maize at the filling stage. As the nitrogen application rate increased, the growth indexes and dry matter accumulation showed a trend of first increasing and then decreasing. The highest values of growth indexes and dry matter were in the N4 treatment. In terms of overall performance, the treatments were ranked as follows: N4>N5>N3>N2>N1. The yield of fresh grass in the multiple cropping system increased gradually as the annual nitrogen application rate increased. The maximum yield in the N5 treatment was 156.8 t?ha-1, which was 61.3% higher than that in the control. The hay yield in the N4 treatment was 39.1 t?ha-1, which was 45.9% higher than that in the control. The recovery of applied N in forage was 31.9%, 30.2%, 27.3% and 18.5% for N2, N3, N4 and N5 treatments, respectively. The nitrogen application rate significantly affected the nutritional quality of forage, with the highest values in the N4 treatment. The contents of crude protein (CP) and crude fat in the triticale forage, corn silage, and the whole cropping system were significantly higher in the N4 treatment than in the other treatments. The CP contents in triticale forage, corn silage, and the whole cropping system were 33.7%, 11.2%, and 31.8% higher, respectively, in the N4 treatment than in the control, but the acid detergent fiber and neutral detergent fiber contents were significantly reduced. The nutrient indexes had optimal values in the N4 treatment. Fertilizer yield response and economic response equations were derived and from these the maximum yield response was predicted to occur at an N application rate of 560 kg?ha-1 and the maximum economic response at 584 kg?ha-1. These results provide data for the theoretical optimization of forage yield in multiple cropping cultivation systems.

Key words: annual optimization of nitrogen fertilizer, irrigation area, forage grass, multiple cropping system, productivity