期刊
JOURNAL OF PLANT NUTRITION
卷 41, 期 5, 页码 627-635出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01904167.2017.1414243
关键词
protein; splitting of N-fertilization; yield
资金
- Spanish Government (MCyT) [AGL2001-2214-CO6-06]
- Basque Government
In Northern Spain, winter wheat is usually fertilized with 180-220kg N/ha split in two applications. To reduce this rate, a strategy was tested which comprised three nitrogen (N)-applications, the latter being tuned to the nutritional needs of the crop using a chlorophyll meter. N-fertilization experiments were performed on winter wheat (Soissons variety). Treatments consisted of three N-broadcasts of 40, 60, and either 0, 40, 60, or 80kg N/ha respectively applied at Zadoks scale growth stages 21, 30, and 37. An over-fertilized treatment of 220kg N/ha was included for normalization of chlorophyll-meter values. Chlorophyll-meter readings were performed at growth stage 37, before fertilization. When normalized chlorophyll-meter values were below 92%, yield and grain protein contents attained with 40+60+0kg N/ha could be respectively enhanced with third applications of 60 or 80kg N/ha and 40kg N/ha.
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