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EFFECTS OF NITROGEN APPLICATION ON BIOMASS ACCUMULATION, REMOBILIZATION, AND SOIL WATER CONTENTS IN A RAINFED WHEAT FIELD

文献类型： 外文期刊

作者： Duan, Wenxue 1 ; Yu, Zhenwen 1 ; Zhang, Yongli 1 ; Wang, Dong 1 ; Shi, Yu 1 ; Xu, Zhenzhu 3 ;

作者机构： 1.Shandong Agr Univ, Minist Agr, Key Lab Crop Ecophysiol & Cultivat, Tai An, Shandong, Peoples R China

2.Shandong Acad Agr Sci, Crop Res Inst, Jinan, Peoples R China

3.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China

关键词： Dry matter accumulation;dry matter remobilization;grain yield;N application rate;rainfed winter wheat;soil water content

期刊名称：TURKISH JOURNAL OF FIELD CROPS （ 影响因子：0.814； 五年影响因子：1.247 ）

ISSN： 1301-1111

年卷期： 2014 年 19 卷 1 期

页码：

收录情况： SCI

摘要： This study examined the effects of different levels of N fertilization on dry matter accumulation and remobilization, and soil water contents in a rainfed winter wheat field. The experiments were carried out during growth seasons in 2009 2012 in a hilly region in Shandong Province, China. The N rates applied were 0 (N0, the control), 90 (N1), 120 (N2), 150 (N3), 180 (N4), and 210 (N5) kg N ha(-1). Our results showed that N fertilization significantly increased dry matter accumulation and post-anthesis assimilates compared with controls. At anthesis, total above-ground biomass increased significantly with increasing N rate up to 150 kg ha(-1) and then leveled off in the 2009 2010 and 2011 2012 growth seasons. However, the biomass in the 2010 - 2011 growth season did not vary with different N rates. At maturity, the accumulation of dry matter in vegetative organs significantly increased with increasing N rate up to 150 kg ha(-1) and then leveled off in all growth seasons. Of all the treatments, N3 and N4 had relatively higher total above-ground biomass at maturity. In contrast, dry matter remobilization efficiency showed a declining trend under increasing N rate. The higher post-anthesis assimilates and the contribution of pre-anthesis assimilates to grains were obtained at N rates of 150 and 180 kg ha(-1) in all growth seasons. Soil water contents in 0 - 120, 0 - 100, and 40 - 160 cm soil layers during each growth season decreased significantly with increasing N rate up to 150 kg ha(-1). The maximum grain yields were obtained under N rate of 150 kg ha(-1) in all growth seasons, with the highest grain yield being 7160.8 kg ha(-1) in the 2011 - 2012 growth season. Our results suggested that N fertilization at 150 kg N ha(-1) was optimal for grain production via promoting above-ground biomass and soil water consumption in deep soil layers. These results should help provide guidance for N fertilization management for optimal and sustainable wheat production in the said region.

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