Effect of sources and rates of nitrogen on nutrients extraction in coastcross pastures

被引：0
|
作者：
Primavesi, AC [1 ]
Primaves, O [1 ]
Corrêa, LD [1 ]
Cantarella, H [1 ]
Da Silva, AG [1 ]
Freitas, AR [1 ]
机构：
[1] Petrobras SA, Financial Support Agreement Embrapa, BR-13560970 Sao Carlos, SP, Brazil
来源：
PROCEEDINGS OF THE XIX INTERNATIONAL GRASSLAND CONGRESS: GRASSLAND ECOSYSTEMS: AN OUTLOOK INTO THE 21ST CENTURY | 2001年
关键词：
mineral extraction; Cynodon dactylon cv. Coastcross; surface application; urea; ammonium nitrate;
D O I：
暂无
中图分类号：
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号：
0905 ;
摘要：
The contents and the extraction of mineral nutrients were determined in a coastcross pasture established on a dark red latosol (Hapludox), in Sao Carlos, SP, Brazil, under tropical altitude climate, receiving five rates of urea and ammonium nitrate, applied on surface. There were differences (P<0.05) among sources and rates of N. Nutrients extraction increased with the nitrogen levels. Especially high were total N (319 and 446 kg ha(-1)) and K (341 and 467 kg ha(-1)) extractions. When forage yield was high (treatment with 500 kg of N ha(-1)) and for both fertilizers, macronutrients extraction was greater for K and N, followed by Ca, S, P and Mg. Micronutrients extraction occurred in the following decreasing order: Fe, Mn, Zn and Cu.
引用
收藏
页码：192 / 193
页数：2
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