The Verification of Variable-Rate Fertilization in Response to the Tiller Number of a Wheat Cultivar for Bread “Setokirara”

日本作物學會紀事

article

水田 圭祐¹  荒木 英樹²  高橋 肇² 

[1] 鳥取大学大学院連合農学研究科;山口大学大学院創成科学研究科

关键词: Diagnosis of crop growth;    Grain protein content;    Intensive nitrogen fertilization during stem elongation (INFDSE);    Variable-rate fertilization;    Wheat cultivar for bread;    Yield.;   

DOI  :  10.1626/jcs.89.299

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The variable-rate fertilization (VRF) based on a diagnosis of crop growth would be effective for the enhancement of yield and quality of wheat. In this study, we hypothesized that control of the tiller number would be important for VRF in wheat grown through intensive nitrogen fertilization during stem elongation (INFDSE) and determined whether yield losses due to poor seedling establishment could be compensated by control of the amount of N top-dressed at tillering (GS14). The poor seedling establishment was reproduced by lowering the sowing density. At the lower sowing density, seedling density was approximately 80 stands per m 2 which was significantly lower than that at the normal sowing density which had approximately 120 stands per m 2 . In GS14, the tiller number at the lower sowing density was also lower than that at the normal sowing density. Increase in the amount of N top-dressed at tillering, however, did not increase the tiller number; the tiller number at the initiation of stem elongation was approximately 400 per m 2 in all treatments. Even in plants grown by INFDSE, a ear number of more than 350 per m 2 could be obtained at the lower sowing density because more than 85% of the tillers formed an ear. As a result, yields of plants grown at the lower sowing density were identical to those of plants grown at the normal sowing density under INFDSE. This study confirmed that under INFDSE, although the tiller number could not be controlled by N top-dressing at tillering, a high yield can be derived at seedling density of more than 80 per m 2 .

【 授权许可】

Unknown