MOISTURE DETERMINATION AT FIELD CAPACITY AND PERMANENT WILTING POINT BY DIFFERENT METHODOLOGIES
Keywords:
capacidade de campo, ponto de murchamento permanente, água disponívelAbstract
This research aimed at determining the values of soil moisture content at field capacity (UCC), of permanent wilting point (UPMP), and of water available (AD) for three types of soil in the municipality of Maringá, state of Paraná, Brazil. The UCC, and UPMP values for clay soils, Typic Harplotox and Rhodic Paleudalf were higher than the values for Quartzipsammentic Haplorthox of medium texture. The AD for Quartzipsammentic Haplorthox was equivalent to that for Rhodic Paleudalf but greater than that for Typic Harplotox. Two alternative methods, tube method 1 (saturated soil) and tube method 2 (saturated soil over dry soil) were tested to determine UCC. MT2 presented the best results and simulated well field conditions, but MT1 overrated the UCC and as values for different matricial values. The biological method (BM) using different culture media provided UPMP results very close to the ones determined by Richards system (SCPR) under the pressure of approximately 15,000cm of water. The results showed the UCC, UPMP, and AD may be determined by simples methods (MT2 and MB).Downloads
Published
2008-07-28
Issue
Section
Agronomy