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

页码：192 / 193

页数：2

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