Caracterização do intervalo hídrico ótimo de um latossolo roxo sob plantio direto

Soil physical attributes, i. e., soil water potential, soil oxygen, and soil strength, directly affect plant growth. The least limiting water range (LLWR) is the range of soil water content within which plant growth is least limited by water potential, aeration and mechanical resistance and has not been evaluated in tropical soils. The objective of this research was to characterize the LLWR of a Typic Hapludox cropped to corn under no-tillage. Seventy-two undisturbed soil samples were collected at the crop row and interrow. The soil water retention curve and the soil resistance curve were evaluated in order to compute the LLWR. The results indicated that the LLWR varied positively with bulk density up to 1.1 Mg m-3 and negatively for higher densities. The LLWR ranged from 0.0073 to 0.1252 m3 m-3. Soil resistance to penetration was the limiting factor at the dry end of the LLWR in 85% of the samples while field capacity was the limiting factor at the wet end in 97%. Further studies on the LLWR in tropical soils would be relevant under a wide range in texture and management.

[1]  B. D. Kay,et al.  Rates of Change of Soil Structure Under Different Cropping Systems , 1990 .

[2]  Howard M. Taylor,et al.  SOIL STRENGTH‐ROOT PENETRATION RELATIONS FOR MEDIUM- TO COARSE‐TEXTURED SOIL MATERIALS , 1966 .

[3]  A. G. Bengough,et al.  Mechanical impedance to root growth: a review of experimental techniques and root growth responses , 1990 .

[4]  A. Gardner,et al.  Control of leaf expansion in wheat seedlings growing in drying soil. , 1990 .

[5]  E. Perfect,et al.  Characterization of the least limiting water range of soils , 1994 .

[6]  B. D. Kay,et al.  Estimating the Least Limiting Water Range of Soils from Properties and Management , 1997 .

[7]  A. H. Hendrickson,et al.  SOIL-MOISTURE CONDITIONS IN RELATION TO PLANT GROWTH. , 1927, Plant physiology.

[8]  L. A. Richards,et al.  FIFTEEN‐ATMOSPHERE PERCENTAGE AS RELATED TO THE PERMANENT WILTING PERCENTAGE , 1943 .

[9]  Michael J. Savage,et al.  Lower Limit of Soil Water Availability , 1996 .

[10]  M. R. Carter.  Temporal variability of soil macroporosity in a fine sandy loam under mouldboard ploughing and direct drilling , 1988 .

[11]  M. Reeve,et al.  THE EFFECT OF DENSITY ON WATER RETENTION PROPERTIES OF FIELD SOILS , 1973 .

[12]  J. Ketcheson,et al.  INFLUENCE OF SOIL BULK DENSITY AND MATRIC PRESSURE ON SOIL RESISTANCE TO PENETRATION , 1972 .

[13]  G. Topp,et al.  THE DETERMINATION OF SOIL-WATER DESORPTION CURVES FOR SOIL CORES , 1979 .

[14]  Anthony R. Dexter,et al.  Advances in characterization of soil structure , 1988 .

[15]  L. P. van Reeuwijk,et al.  Pedotransfer functions for the estimation of moisture retention characteristics of Ferralsols and related soils , 1997 .

[16]  C. Phene,et al.  High-frequency Irrigation for Water Nutrient Management in Humid Regions1 , 1976 .

[17]  J. Passioura,et al.  The Effect of Soil Strength on the Growth of Young Wheat Plants , 1987 .

[18]  F. R. Boone,et al.  The effect of compaction of the arable layer in sandy soils on the growth of maize for silage. 1. Critical matric water potentials in relation to soil aeration and mechanical impedance , 1986 .

[19]  A. Dexter,et al.  Soil physics towards 2000 , 1992 .

[20]  J. Letey.  Relationship between Soil Physical Properties and Crop Production , 1958 .

[21]  W. Ehlers,et al.  Penetration resistance and root growth of oats in tilled and untilled loess soil , 1983 .

[22]  A. R. Grable,et al.  Effects of Bulk Density, Aggregate Size, and Soil Water Suction on Oxygen Diffusion, Redox Potentials, and Elongation of Corn Roots 1 , 1968 .

[23]  F. Boone.  Weather and other environmental factors influencing crop responses to tillage and traffic. , 1988 .

[24]  D. K. Cassel,et al.  Field Capacity and Available Water Capacity , 2018, SSSA Book Series.

[25]  F. Boone,et al.  The effect of compaction of the arable layer in sandy soils on the growth of maize for silage. 2. Soil conditions and plant growth. , 1987 .

[26]  W. J. Busscher,et al.  ADJUSTMENT OF FLAT-TIPPED PENETROMETER RESISTANCE DATA TO A COMMON WATER CONTENT , 1990 .

[27]  R. Horton,et al.  Tillage Effects on Soil Water Retention and Pore Size Distribution of Two Mollisols1 , 1985 .

[28]  S. Lorentz,et al.  The effect of soil compaction and soil physical properties on the mechanical resistance of South African forestry soils , 1997 .

[29]  W. E. Larson,et al.  Estimating soil water retention characteristics from particle size distribution, organic matter percent, and bulk density , 1979 .

[30]  J. Archer,et al.  THE RELATION BETWEEN BULK DENSITY, AVAILABLE WATER CAPACITY, AND AIR CAPACITY OF SOILS , 1972 .

[31]  K. Reichardt.  Capacidade de campo , 1988 .

[32]  D. L. Brakensiek,et al.  Estimation of Soil Water Properties , 1982 .

[33]  D. Devitt,et al.  Turfgrass quality, growth, and water use influenced by salinity and water stress , 1996 .

[34]  A. Hamblin,et al.  The influence of soil structure on water movement, crop root growth, and water uptake , 1986 .

[35]  M. Pilatti,et al.  Soil Quality: An Approach to Physical State Assessment , 1997 .

[36]  William J. Davies,et al.  Root Signals and the Regulation of Growth and Development of Plants in Drying Soil , 1991 .

[37]  H. R. Haise,et al.  Soil Moisture Studies of Some Great Plains Soils: II. Field Capacity as Related to 1/3‐Atmosphere Percentage, and “Minimum Point” as Related to 15‐ and 26‐Atmosphere Percentages , 1955 .