Effects of foliar and root applied nitrogen on nitrogen uptake and movement in white clover at low temperature

被引:5
|
作者
Castle, M. L. [1 ,2 ]
Crush, J. R. [1 ]
Rowarth, J. S. [2 ]
机构
[1] Ruakura Agr Res Ctr, AgRes, Hamilton 3240, New Zealand
[2] UNITEC, Auckland 1142, New Zealand
关键词
nitrate; roots; starch; sucrose; transpiration; Trifolium repens L; urea; white clover;
D O I
10.1080/00288230709510314
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
'Grasslands Huia' white clover plants were grown at a constant root and shoot temperature of 8 degrees C in a controlled environment room. Nitrate or urea labelled with N-15 was applied to the foliage, foliage plus the roots, or to the roots only. After 21 days, plants supplied with foliar nitrogen (N) or with N to the foliage plus roots, produced significantly (P < 0.05) more lamina dry weight than plants supplied with N to the roots only. Plants supplied with N to the foliage contained significantly (P < 0.05) more lamina 15 N than plants supplied with N to the foliage plus the roots or to the roots only. From 14 days onwards, plants supplied with foliar N, or N to the foliage plus the roots, had significantly (P < 0.05) higher leaf areas than plants supplied with N to the roots only, irrespective of the form of N applied. By 21 days, plants supplied with foliar nitrate or urea had significantly (P < 0.05) higher photosynthesis, transpiration, stomatal conductance rates, and lamina sucrose concentrations, than plants supplied with N to the roots. The experiment demonstrated the importance of N availability as a rate-limiting factor on starch and sucrose synthesis and, in turn, on foliage growth at low temperatures in white clover.
引用
收藏
页码:463 / 472
页数:10
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