CRITICAL NITROGEN CURVE AND NITROGEN NUTRITION INDEX FOR SPRING MAIZE IN NORTH-EAST CHINA

Autor:	Jiyun Jin, Wenjuan Li, Ping He
Rok vydání:	2012
Předmět:	geography Biomass (ecology) geography.geographical_feature_category Plateau Physiology chemistry.chemical_element Growing season Biology Nitrogen Human fertilization Agronomy chemistry Shoot Spring (hydrology) Dry matter Agronomy and Crop Science
Zdroj:	Journal of Plant Nutrition. 35:1747-1761
ISSN:	1532-4087 0190-4167
Popis:	The study was conducted at three sites during 2008 and 2009 in the North-East China Plain (NECP). Field experiments consisted of five or six nitrogen (N) fertilization rates (0–350 kg N ha−1). Shoot biomass and N concentration (Nc) of spring maize (Zea mays L.) were determined on six sampling dates during the growing season. Nitrogen application rate had a significant effect on aerial biomass accumulation and Nc. As expected, shoot Nc declined during the growing period. A critical N dilution curve (Nc = 36.5 W −0.48) was determined in China, which was a little different from those reported for maize in France and Germany. Besides, the N nutrition index (NNI) calculated from this critical N dilution curve was significantly related to relative grain yield, which can be expressed by a linear with plateau model (R2 = 0.66; P < 0.001). NNI can be used as a reliable indicator of the level of N deficiency during the growing season of maize.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d1d7293b7c8658767d1cc51e259bb106 https://doi.org/10.1080/01904167.2012.698354 Zobrazit plný text záznamu