Latest News on Loam Soil Research: Dec – 2019

Physical Characteristics of Le Sueur Clay Loam Soil Following No-till and Conventional Tillage 1

Although the consequences of no-till on crop yields has been widely investigated, there are virtually no data on its physical effects on clay loam soils like those within the Corn Belt. so as to match the consequences of no-till with conventional fall plow tillage on a south-central Minnesota clay loam soil (Aquic Argiudoll), we measured some soil physical properties 6 years after beginning a field experiment with corn (Zea mays L.). Data show that soil under no-till had significantly greater bulk density, both in spring and fall, for samples within the surface 30 cm. Densities of no-till soil ranged from 1.24 to 1.32 g/cm3 in in contrast to those of conventional tillage, which ranged from 1.05 to 1.12 g/cm3. Air-filled porosities of surface samples under no-till were lower in the least potentials measured. At −100 rob, no-till averaged 0.143 cm3/cm3 compared to 0.198 cm3/cm3 for conventional tillage. Mean number of channels 1 mm and greater created by earthworms and decomposed rootlets were significantly greater for no-till, starting from 666 to 1,732/m2 compared to 243 to 1,475/m2 for conventional tillage. [1]

Water movement through Panoche clay loam soil

Water movement through Panoche clay loam is explained on the idea of the soil-water properties within the profile. Laboratory-determined soil water content-tension relations from 3-inch cores taken from the sector every 6 inches to five feet were shown to supply reliable estimates of soil water behavior. Water management practices relative to favorable plant-available soil water and favorable salt balance within the profile are discussed. [2]

Soil Water Hysteresis in Silt Loam and Clay Loam Soils

The microhydrologic properties involving water content, pressure head, and hydraulic conductivity were measured simultaneously for a silt loam and for a clay loam soil. Large hysteresis within the water content‐pressure head relationship was found for both soils, the silt loam soil showing the larger amount. There was no measurable hysteresis within the relationship between hydraulic conductivity and water content in either soil. the info from the clay loam soil showed considerable scatter attributed to structural rearrangement within the soil during measurement. A formulation of the independent domain theory by Everett was unsatisfactory for predicting the observed scanning curves within the water content‐pressure head relationships of both soils. A theorem of an alternate formulation by Enderby was tested by comparing differences in slopes for reversals from drying to wetting along the most curves to those found on a scanning curve; Enderby’s formulation was probably no better for the silt loam soil under the conditions of test than that of Everett. [3]

A modelling approach to evaluate the long-term effect of soil texture on spring wheat productivity under a rain-fed condition

Soil surface texture is a crucial environmental factor that influences crop productivity due to its direct effect on soil water and sophisticated interactions with other environmental factors. Using 30-year data, an agricultural system model (DSSAT-CERES-Wheat) was calibrated and validated. After validation, the modelled yield and water use (WU) of spring wheat (Triticum aestivum L.) from two soil textures (silt loam and clay) under rain-fed condition were analyzed. multivariate analysis showed that wheat grown in silt loam soil is more sensitive to WU than wheat grown in clay soil, indicating that the wheat grown in clay soil has higher drought tolerance than that grown in silt loam. [4]

Infiltration Models Validation in a Sandy Loam Soil in Zing, Taraba State

Predicting the infiltration characteristics for soils is crucial for proper management and sustainable use of soil and water resources for prevention of abrasion. The study was administered to guage the infiltration models by measuring the world infiltration rate on sandy loam soils in Zing. Kostiakov, Modified – Kostiakov and Horton infiltration models were evaluated by comparing the measured and predicted infiltration rate of the soils. Fifteen infiltration runs were made by ponding water into double ring infiltrometer which was used to perform the measurements. Parameters were developed from measured infiltration data and laboratory analyses of soil samples. [5]

Reference

[1] Gantzer, C.J. and Blake, G.R., 1978. Physical characteristics of le sueur clay loam soil following no-till and conventional tillage 1. Agronomy Journal, 70(5), (Web Link)

[2] Nielsen, D., Davidson, J., Biggar, J. and Miller, R., 1964. Water movement through Panoche clay loam soil. Hilgardia, 35(17), (Web Link)

[3] Topp, G.C., 1971. Soil water hysteresis in silt loam and clay loam soils. Water Resources Research, 7(4), (Web Link)

[4] A modelling approach to evaluate the long-term effect of soil texture on spring wheat productivity under a rain-fed condition
Yong He, Lingling Hou, Hong Wang, Kelin Hu & Brian McConkey
Scientific Reports volume 4, (Web Link)

[5] J. Philip, H., A. Gisilanbe, S., T. Gani, A. and W. Joram, T. (2018) “Infiltration Models Validation in a Sandy Loam Soil in Zing, Taraba State”, Asian Journal of Soil Science and Plant Nutrition, 3(3), (Web Link)

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