Limitations of Auto-Irrigators for Controlling Soil Moisture Under Growing Plants

Abstract

(5) used tenisions up to 40 cm. of mercury and state, "The moisture conditions of the soil are now among the environmental conditions most susceptible of control and satisfactory measurement." Tensions of 60 to 65 cm. of mercury, equivalent to 8 or 9 meters of water, were considered to be maximum for satisfactory irrigator performance.

Studies in the Water Relations of the Cotton Plant

“…It is suggested that this is because the movement of moisture in the soil is so slow that the roots of actively transpiring plants cause a zone of dryness to develop around themselves. That such a drying out in the neighbourhood of roots does occur has been demonstrated by Aldrich, Work & Lewis (1935) ' Davis (1940) and Richards & Loomis (1942). It was the potential of the water in these dried zones and not of the soil as a whole which was reflected in the plant.…”

Three New Imidazole‐Functionalized Hexanuclear Oxidovanadium Clusters with Exceptional Catalytic Oxidation Properties for Alcohols

“…According to Darcy's law, liquid flow through a porous medium should be constant under a fixed flow system in a particular water supply tension,43 thus the rate of water loss (which was considered as the rate of ET) should always be the same under a particular water supply tension. During our experiment, we noted differences in ET at different growth period and between treatments (with or without SAP) especially under moderate and deficit irrigation where the greater ET (Fig.…”

A quantitative analysis of the relationships between root distribution and nitrogen uptake from soil by two grass species

“…When the mean daily water uptake rate per container was constant for 5 consecutive days, it was assumed that the soil had reached equilibrium with respect to moisture (cf. Richards & Loomis, 1942); this took 3 9 4 2 days.…”