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Crop Growth, Development and Grain Yield of Soybean Submitted to Different Irrigation Management

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  032225,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13803) @2003
Authors:   Mirta Teresinha Petry, Giane Lavarda Melo, Reimar Carlesso, Cleudson José Michelon, Genésio Mario da Rosa
Keywords:   Irrigation water management, soybean, evapotranspiration

The objective of this work was to evaluate crop growth, canopy development and yield of soybean plants submitted to different irrigation regimes. The experiment was conducted in the experimental area of the Agricultural Engineering Department at the Federal University of Santa Maria, RS, Brazil, during the 2001/02 growing season. A completely randomized design, with four treatments and two replications was used. The irrigation management treatments were: 20, 40, 60 and 80 mm of cumulative maximum crop evapotranspiration, estimated by Penman-Monteith equation, as the irrigation depth trigger. After reaching these values, irrigation application was based on daily maximum crop evapotranspiration. The experimental site was protected against rainfall through an arch rain shelter structure. Soybean was sown using the no-tillage system, with 0.45 m rows space and a plant density of about 155,000 plants ha-1.

Determinations of leaf area, plant height, number of nodes and internode length were measured twice a weak. Soil water content was also measured twice a week to determine plant water extraction and plant available water to soybean. Results indicate that the irrigation management with the application of water depths trigger ranging from 20 to 80 mm does not cause differences on plant height and number of nodes. However, differences in leaf area index and internode length were observed at 56 days after emergency. Results of soybean grain yield were adjusted to a quadratic equation considering the irrigation water depth trigger from 20 to 80 mm of cumulative maximum crop evapotranspiration. Maximum technical efficiency (3.028 Mg ha-1) was obtained using the irrigation management trigger of 44 mm.

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