Effect of nitrogen rate and time of application on seed yield in perennial ryegrass cv. Grasslands Nui
Effect of nitrogen rate and time of application on seed yield in perennial ryegrass cv. Grasslands Nui
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DOI：
10.1080/03015521.1987.10425529
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
J. Hampton
中科院分区：
文献类型：
--
作者：
J. Hampton
Abstract Applying nitrogen (N) as urea in the autumn only, or with the application split between autumn and spring, reduced the seed yield of Lolium perenne L. cv. Grasslands Nui compared with applying all the N in the spring at spikelet initiation. Seed yield reductions resulted from reductions in the number of seeds retained per spikelet, because other yield components did not differ. Splitting spring applications betwen spikelet initiation, ear emergence, and anthesis did not change seed yield or increase 1000-seed weight. The soil incubation method was used to estimate soil N status in 1984 and 1985. Increasing the total N available to 130 kg ha-1 by applying 70 kg ha-1 at spikelet initiation in 1984 and 100 kg ha-1 at spikelet initiation in 1985, increased seed yield from 45 to 70 g m-2 in the former and from 34 to 112 g m-2 in the latter season. The application of 150 and 200 kg N ha-1 in 1985 did not significantly increase seed yield over that obtained from plots where 100 kg N ha-1 had been applie...
