Evolution and spatial variability of salinity in a Fluvic Neossol cropped with irrigated carrot

Revista Brasileira de Engenharia Agrícola e Ambiental

Montenegro, Abelardo A. A.¹  Freire, Maria B. G. dos S.¹  Souza, Edivan R. de¹ 

[1] UFRPE, Recife

关键词: geoestatistics;    sodium adsorption ratio;    exchangeable sodium percentage;    Daucus carota L;   

DOI  :  10.1590/S1415-43662008000600004

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

A field experiment was carried out aiming to verify the effect of micro sprinkler irrigation, using water with an average electrical conductivity of 1.42 dS m-1, on the chemical properties of a Fluvic Neossol cropped with carrot, variety Brasília. The area was divided into two sectors (S1 and S2), each one with 900 m2 (30 x 30 m) and contrasting textures; at S2 mulch was added at day 23 after sowing (DAS). A leaching fraction of 0.20 was adopted for both sectors. Two soil sampling schemes were carried out, before sowing and at 96 DAS, in the 0-20 and 20-40 cm layers, at 49 points in S1 and 52 points in S2, according to a regular 5 x 5 m mesh. In the extract of saturated soil paste, pH and electrical conductivity (ECse) were measured, and exchangeable cations in soil were evaluated; in addition, the sodium adsorption ratio and the exchangeable sodium percentage were calculated. Data has been analysed using descriptive statistics and geostatistics. Considering the 0-40 cm layer, the saline area at S1, covering 7.98% at the beginning, increased to 15.09% by the end of the cropping period. For S2, the percentage of saline area shifted from 5.97% to 5.52%. The decisive influence of texture and mulch for the control of soil salinity has thus been verified.

【 授权许可】

CC BY-NC