PRODUCTION AND NUTRITIVE VALUE OF CANARANA ERECTA LISA (Echinocloa piramidalis Lam.) IN RESPONSE TO HARVEST INTERVALS

Abstract The objective of this study was to compare and explain the variations in the production and nutritive value of canarana erecta lisa grass (Echinocloa pyramidalis Lam.) at different harvest intervals. The treatments corresponded to the cut intervals of 20, 27, 34, 41, 48, 55, 62, and 69 days. The experimental design was a randomized complete block design with three replications. Each experimental unit had 6m2 (3m ×2m). The variables studied included forage production, canopy height, and nutritive value o harvested forage. Forage production varied from 11517 to 12324 kg ha-1; Plant heights from 48.8 to 234 cm; Neutral detergent fiber (NDF) from 68.8% to 71.13%; Acid detergent fiber (ADF) from 36.20% to 44.15%; Crude protein (CP) from 11.43% to 5.85% and in “in vitro” dry matter digestibility (IVDMD) from 63.30% to 47.42%. These values indicated that the nutritive value of canarana erecta lisa was reduced at longer harvest intervals. It is recommended to harvest the grass at 35 days of regrowth favoring productivity, nutritive value and forage digestibility.

摘要 本研究旨在对比并阐释卡纳拉直立利萨草（Echinocloa pyramidalis Lam.）在不同刈割间隔下的产量与营养价值变化。试验设置20、27、34、41、48、55、62、69天共8个刈割间隔处理。试验采用完全随机区组设计，设置3次重复，每个试验单元面积为6平方米（3m×2m）。本试验测定的指标包括牧草产量、冠层高度以及收获牧草的营养价值。牧草产量范围为11517~12324 kg·ha⁻¹；植株高度范围为48.8~234 cm；中性洗涤纤维（Neutral detergent fiber, NDF）含量为68.8%~71.13%；酸性洗涤纤维（Acid detergent fiber, ADF）含量为36.20%~44.15%；粗蛋白（Crude protein, CP）含量为11.43%~5.85%；体外干物质消化率（in vitro dry matter digestibility, IVDMD）为63.30%~47.42%。上述结果表明，随着刈割间隔延长，卡纳拉直立利萨草的营养价值逐渐降低。研究建议在牧草再生35天时进行刈割，可兼顾牧草产量、营养价值与消化率。