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Does manipulating harvest regime of single-cut 'Fahl' berseem clover compensate for reduced seeding rate?
Grassland Science ( IF 1.1 ) Pub Date : 2020-11-18 , DOI: 10.1111/grs.12308
Heba Sabry Attia Salama 1 , Ali Issa Nawar 1
Affiliation  

Providing precise information about the variations in yield and quality of single-cut 'Fahl' berseem clover (Trifolium alexandrinum L.) in relation to crop's harvest regime and seeding rate would support its optimal utilization in rotation with other crops grown in the Mediterranean environment. Current study investigated the variations in fodder yield and nutritive value of 'Fahl' berseem clover when cut at three harvesting regimes, adjusted in terms of three phenological stages: bud stage (60 days after sowing—DAS), early flowering (75 DAS) and full flowering (90 DAS) under elevated seeding rates (25%, 50%, 75% and 100% of the recommended). When 'Fahl' berseem clover was harvested at bud stage, the use of increased seeding rates was essential for higher fodder yield, while delaying harvesting to early or full flowering provided a good compensation to the reduced seeding rates. The optimal fresh fodder yield was achieved when the crop was cut at early flowering (75 DAS) with 55% seeding rate. Seeding rate had minimal effect on the studied fodder quality parameters, which were significantly variable according to the harvest regime. Late harvests were characterized by higher dry yield, dry matter accumulation, fiber and non-fiber carbohydrates contents, yet lower crude protein. The highest significant crude protein content was a character of the crop harvested at early flowering (75 DAS) with around 60% seeding rate. In a similar Mediterranean context, 'Fahl' berseem clover can provide reasonable amount of forage of good quality throughout the autumn growth period when harvesting is done at early flowering and seeding rate is reduced to 60% of the recommended.

中文翻译:

操纵单切 'Fahl' berseem 三叶草的收获制度是否可以弥补播种率的降低?

提供有关单切'Fahl' berseem 三叶草(Trifolium alexandrinum )产量和质量变化的准确信息L.) 与作物的收获制度和播种率有关,这将支持其与地中海环境中种植的其他作物轮作的最佳利用。目前的研究调查了在三种收获方式下切割 'Fahl' berseem 三叶草时饲料产量和营养价值的变化,根据三个物候阶段进行调整:芽期(播种后 60 天 - DAS)、早花(75 DAS)和在高播种率(推荐的 25%、50%、75% 和 100%)下完全开花(90 DAS)。当 'Fahl' berseem 三叶草在芽期收获时,使用增加的播种量对于提高饲料产量至关重要,而将收获延迟到早花或全花期为减少的播种量提供了良好的补偿。当作物在早花 (75 DAS) 以 55% 的播种率进行切割时,可实现最佳的新鲜饲料产量。播种量对所研究的饲料质量参数的影响很小,根据收获制度,这些参数有很大的变化。晚收的特点是较高的干产量、干物质积累、纤维和非纤维碳水化合物含量,但粗蛋白较低。最高的显着粗蛋白含量是在早花 (75 DAS) 收获的作物的特征,播种率约为 60%。在类似的地中海环境中,'Fahl' berseem 三叶草可以在整个秋季生长期提供合理数量的优质草料,此时在早花期收割,播种量减少到推荐量的 60%。播种量对所研究的饲料质量参数的影响很小,根据收获制度,这些参数有很大的变化。晚收的特点是较高的干产量、干物质积累、纤维和非纤维碳水化合物含量,但粗蛋白较低。最高的显着粗蛋白含量是在早花 (75 DAS) 收获的作物的特征,播种率约为 60%。在类似的地中海环境中,'Fahl' berseem 三叶草可以在整个秋季生长期提供合理数量的优质草料,此时在早花期收割,播种量减少到推荐量的 60%。播种量对所研究的饲料质量参数的影响很小,根据收获制度,这些参数有很大的变化。晚收的特点是较高的干产量、干物质积累、纤维和非纤维碳水化合物含量,但粗蛋白较低。最高的显着粗蛋白含量是在早花 (75 DAS) 收获的作物的特征,播种率约为 60%。在类似的地中海环境中,'Fahl' berseem 三叶草可以在整个秋季生长期提供合理数量的优质草料,此时在早花期收割,播种量减少到推荐量的 60%。晚收的特点是较高的干产量、干物质积累、纤维和非纤维碳水化合物含量,但粗蛋白较低。最高的显着粗蛋白含量是在早花 (75 DAS) 收获的作物的特征,播种率约为 60%。在类似的地中海环境中,'Fahl' berseem 三叶草可以在整个秋季生长期提供合理数量的优质草料,此时在早花期收割,播种量减少到推荐量的 60%。晚收的特点是较高的干产量、干物质积累、纤维和非纤维碳水化合物含量,但粗蛋白较低。最高的显着粗蛋白含量是在早花 (75 DAS) 收获的作物的特征,播种率约为 60%。在类似的地中海环境中,'Fahl' berseem 三叶草可以在整个秋季生长期提供合理数量的优质草料,此时在早花期收割,播种量减少到推荐量的 60%。
更新日期:2020-11-18
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