Seedling emergence and herbage yield of summer-active tall fescue sown at different times and sowing depths

María José Beribe, Pablo Barletta, Jorge Omar Scheneiter
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Abstract

Background

Tall fescue is sensitive to sowing depth and, in the Pampas region of Argentina, its sowing is often delayed from autumn (average air temperature 18.5°C) to winter (average air temperature 10.0°C). Since tall fescue is sensitive to the sowing depth, and temperature determines the emergence period, this study aimed to evaluate the effect of sowing depth at different times on seedling emergence and herbage yield.

Methods

Two field experiments were carried out in Pergamino, Buenos Aires province, Argentina, to evaluate a summer-active tall fescue at two sowing times and five sowing depths. The emergence of seedlings and the herbage yield in the year of sowing were determined.

Results

Seedling emergence was maximal when sown at 1.2–1.5 cm depth and at 230 growing degree days (GDD) in early autumn and 257 GDD in winter. In both years and sowing seasons, herbage yield was positively related to the number of seedlings at maximum emergence.

Conclusions

No differences in seedling emergence were observed between the autumn and winter sowings, and the emergence of tall fescue was well explained by the thermal time. The concept of “critical depth” was determined as the sowing depth at which the greatest seedling emergence and forage yield are achieved.

Abstract Image

夏生高羊茅不同播期和播深的出苗率及牧草产量
高羊茅对播种深度很敏感,在阿根廷潘帕斯地区,它的播种经常从秋季(平均气温18.5°C)推迟到冬季(平均气温10.0°C)。由于高羊茅对播种深度敏感,而温度决定出苗期,本研究旨在评价不同时间播种深度对出苗期和牧草产量的影响。方法在阿根廷布宜诺斯艾利斯省佩加米诺进行两项田间试验,对一种夏活型高羊茅进行2次播期和5种播深的评价。测定了播种当年的出苗情况和牧草产量。结果播种深度为1.2 ~ 1.5 cm,初秋播种时间为230 GDD,冬季播种时间为257 GDD,出苗率最高。在年际和播季,牧草产量与最大出苗量呈正相关。结论秋冬播种对高羊茅出苗率无显著影响,高羊茅的出苗率与播种时间有关。“临界深度”的概念被确定为幼苗出苗率和饲料产量达到最大的播种深度。
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