中国农业科学 ›› 2005, Vol. 38 ›› Issue (08): 1555-1561 .

• 耕作栽培.生理生态 • 上一篇    下一篇

留茬高度与刈割时期对墨西哥玉米再生性能的影响

王永军,王空军,董树亭,胡昌浩,刘 鹏,张吉旺   

  1. 山东农业大学农学院
  • 收稿日期:2004-12-09 修回日期:1900-01-01 出版日期:2005-08-10 发布日期:2005-08-10
  • 通讯作者: 王空军

Effects of Stubble Height and Clipping Stage on Regrowth Performances of Zea mexicana

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  1. 山东农业大学农学院
  • Received:2004-12-09 Revised:1900-01-01 Online:2005-08-10 Published:2005-08-10

摘要: 采用大田小区栽培试验,研究了留茬高度和刈割时期对墨西哥玉米(Zea mexicana)再生性能(包括再生草产量和饲用营养品质)的影响。刈割时期的确定以植株高度为准,运用概略养分分析法评价饲用品质并引入再生系数(RGC)的概念判定其再生性能。结果表明,株高95 cm时刈割,留茬30 cm的再生草产量和总能量最高,分别为11.60 kg·m-2(鲜草重)和278 kJ·m-2,显著高于留茬20 cm(CK)与10 cm处理;留茬30 cm再生草的粗蛋白和无氮浸出物含量较高,粗灰分和酸性洗涤纤维含量较低。留茬20 cm,不同时期刈割,株高130 cm与95 cm(CK)的再生产量、总能量差异不显著,但明显高于株高60 cm处理;但再生草饲用品质以株高60 cm时刈割最佳。比较发现,RGC接近2.5时墨西哥玉米再生性能最好,对应的刈割方式(留茬30 cm,株高95 cm)可实现其优质高产。

关键词: 墨西哥玉米, 留茬高度, 刈割时期, 再生产量, 饲用品质, 再生系数

Abstract: A fieldplot experiment in 2002 and 2003 was conducted to study the effects on regrowth performances (including the yield and forage nutritive quality of the regrowth) of Zea mexicana cut at different clipping stages with different high stubbles. The plant height was regarded as the criteria to establish the clipping stage. The treatments cut at different stages with the same high stubble and cut at different stubble height with the same high plant. The approximate analysis method was utilized to evaluate the forage nutritive quality of the regrowth, and the conception of regrowth coefficient (RGC) was introduced to determine the regrowth performances of Zea mexicana in this experiment. The findings of the experiment demonstrated that the regrowth yield and gross energy (GE) yield of treatment Ⅱ clipped with 30 cm stubble and 95 cm plant were higher than the control (stubble height: 20 cm) and treatment Ⅰ(stubble height: 10 cm), reached 11.60 kg·m-2 (fresh weight) and 278 kJ·m-2,respectively. The crude protein content and nitrogen free extract content of the regrowth of treatment Ⅱ were higher,while the crude ashes content and acid detergent fiber content were reverse. The regrowth yield and GE yield of treatment Ⅳ clipped with 20 cm stubble and 130 cm plant had no significant difference to those of the control,and were significantly higher than those of treatment Ⅲ (plant height: 65 cm) in this experiment. The regrowth forage nutritive quality of treatment Ⅲ was the highest of the five treatments. According to the regrowth yield and forage quality,the treatment with RGC≈2.5 had the best regrowth performances,and the cutting mode with 30cm stubble and 95cm plant was able to make Zea mexicana be high yield and high quality.

Key words: Zea mexicana, Stubble height, Clipping stage, Regrowth yield, Forage quality, Regrowth coefficient