Nutrient losses by water erosion

Scientia Agricola

Ildegardis Bertol²  Eloy Lemos Mello²  Jean Cláudio Guadagnin²  Almir Luis Vedana Zaparolli¹  Marcos Roberto Carrafa¹ 

[1] ,UDESC CAV Depto. de SolosLages SC ,Brasil

关键词: nutrient concentration;    water loss;    simulated rainfall;    concentração de nutrientes;    perda de água;    chuva simulada;   

DOI  :  10.1590/S0103-90162003000300025

来源: SciELO

【 摘 要 】

Water erosion causes soil degradation, which is closely related to nutrient losses either in, the soluble form or adsorbed to soil particles, depending mainly on the adopted soil management system. This study was carried out in São José do Cerrito, SC, Brazil, between March 2000 and June 2001. The objective was to quantify available nitrogen, phosphorus, potassium, calcium and magnesium losses in water erosion obtained with simulated rainfall in the following soil management systems: conventional tillage with no-crop (bare soil) (BS), conventional tillage with soybean (CT), reduced tillage with soybean (RT), no tillage with soybean on a desiccated and burned natural pasture (DBNP), and no tillage with soybean on a desiccated natural pasture (DNP). A rotating boom rainfall simulator was used to perform three rainfall tests with constant intensity of 64 mm h-1 and sufficient duration to reach constant runoff rate, on a clayey-loam, well-structured Typic Hapludox, with an average slope of 0.18 m m-1. The first test was carried out five days before soybean emergence and the second and third at 30 and 60 days, respectively. The nutrient concentration in water and total losses of nitrogen, phosphorus, potassium, calcium and magnesium were higher under CT than in the other soil management systems.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License