氮密互作对德美亚1号青贮产量及品质的调控效应

Interactive Effects of Nitrogen and Density on Silage Yield and Quality of DeMeiYa 1

摘要: 为明确冀西北坝上农牧交错区氮密互作对青贮玉米产量和品质调控效应，本文选用早熟品种德美亚1号为材料。结果表明：增氮和增密均显著提高青贮玉米生育期的叶面积指数；增氮极显著提高青贮玉米叶片SPAD值，但增密SPAD值显著降低。本研究范围内，增氮和增密对DMY1青贮产量均无显著影响。密度和施氮量对DMY1青贮玉米品质粗蛋白、酸性洗涤纤维、中性洗涤纤维、淀粉、水溶性碳水化合物、灰分、总可消化养分和牛奶生产力的影响均未达显著水平。综之在本研究范围内，冀西北农牧交错区青贮玉米施氮量宜控制在180~225 kg∙hm⁻²，降低面源污染，密度范围为6.75~9.0万株hm⁻²防止倒伏，以实现青贮玉米的高产与优质。

Abstract: In order to identify the interactive effects of nitrogen and density on forage yield and quality of si-lage maize in farming-pastoral interlacing area of Northwest Hebei province, early maturing maize hybrid DMY1 was used as material in this study. The results showed that the leaf area index (lai) of DMY1 at silking stage and maturity stage was significantly increased by nitrogen and density increased. The leaf SPAD value was significantly increased by nitrogen addition, but decreased by density increasing. But in this study, there were no significant difference between DMY1 silage yields among nitrogen application treatments and density treatments, respectively. The effects of nitrogen application and density on DMY1 crude protein, acidic washing fiber, neutral washing fiber, starch, water-soluble carbohydrate, ash, total digestible nutrient and milk productivity were not significant. Therefore, to achieve high yield and high quality in the farming-pastoral interlacing area of Northwest Hebei province, the nitrogen application of the silage maize should be controlled at 180 - 225 kg∙ha⁻¹ to reduce the non-point source pollution, and the density should be controlled at 6.75 ×10⁴ – 9.0 × 10⁴ plants∙ha⁻¹ to reduce the lodging risk.