| 摘要: |
| 以扁穗冰草为材料，通过肥料的施用与行内疏枝组合处理，2年的试验结果表明：限制扁穗冰草种子产量的主要营养元素依次是氮、磷、钾。连续2年施氮，种子产量显著增加，秋施N45kg／hm^2、春施N90kg／hm^2、行内疏枝到45cm的扁穗冰草种子产量最高达924．3kg／hm^2；同一施氮量下，秋春季2次施氮的扁穗冰草种子产量高于春季一次施氮处理，另外，氮、磷、钾配施可以显著提高扁穗冰草种子产量。单位面积生殖枝数是影响扁穗冰草种子产量的主要组成因素，秋季施氮可以显著增加第二年单位面积生殖枝数，春季施磷有利于生殖枝数、小穗数、种子千粒重增加：春季施钾可以增加每小穗小花数、每小穗种子数及种子千粒重，疏行处理可以提高每生殖枝小穗数和小花数、每小穗种子数、种子千粒重。 |
| 关键词: 扁穗冰草 种子产量 生殖枝 施肥 |
| DOI：10.11841/j.issn.1007-4333.2005.03.061 |
| 修订日期：2004-12-31 |
| 基金项目:高等学校博士点基金资助项目(20010019004)，国家“948”重大项目(202009) |
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| Effect of fertilizer application on seed yield and yield components of Agropyron cristatum |
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| Abstract: |
| Agropyron cristatum (Wheatgrass) was grown under fertilizer application and treated with row spacing . The data in both 2002 and 2003 indicated that nitrogen (N) was the most important element in Agropyron cristatum seed production. The elements of phosphorus (P) and potassium (K) were also important. Seed yield of Agropyron cristatum increased significantly due to N fertilizer application from 2002 to 2003. The highest yield of 9243kg/hm2 was obtained in the plot with 45cm row spacing, N 45kg/hm2 in autumn and N 90kg/hm2 in spring. N application in both autumn and spring resulted in higher seed yield than only in spring although N quantity was same. The number of fertile tiller was the most important factor in the seed yield formation. It increased significantly with N application in last autumn. Using P fertilizer in spring was benefit to develop fertile tiller, spikelet and seed weight. However, K fertilizer application in spring was in favor of floret, seed number andseed weight. Spikelet, floret, seed number and seed weight of Agropyron cristatum were also improved by thinning row spacing. |
| Key words: Agropyron cristatum,seed yield,fertile tillers,fertilizer application |
