The availability of soil moisture to plants

Sykes, Dwane Jay

doi:10.31274/rtd-180813-1724

Cited by 2 publications

(4 citation statements)

References 67 publications

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“…Plant available water in soil (PAW) ranges from permanent wilting point (θPWP) to θFC (Haise, 1955;Sykes, 1964;da Silva et al, 1994;Reynolds et al, 2009). The PAW is divided into two parts by the θTHR as far as plant are concerned (Ritchie, 1981).…”

Section: Discussionmentioning

confidence: 99%

Prediction of soil-water thresholds for plant responses

Chi¹

2022

Preprint

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Background It is well known that there is a soil water content threshold (θTHR) for plant growth and physiological processes. It is very import to obtain the θTHR for agriculture water management . However the measurement of θTHR needs specialized and expensive equipment. The θTHR can also be considered as the soil water content of capillary break (θCB). The θTHR can be calculated based on soil water retention curve. But the obtainment of soil water retention curve is time-consuming. Therefore, a simple and rapid prediction of θTHR is the focus of this study. Aims The θTHR can be predicted by estimating the θCB since the θTHR is generally regarded as the θCB. Whether the θCB can be estimated by simple soil parameters such as field capacity (θFC) and soil bulk density (Db)? Is the estimated θCB equal to the measured θTHR? Which of soil or plant is the major factor affecting the θTHR?Methods An formula of B was proposed to estimate θCB. Eight soils from six literature were used to calculate values of θCB. Theses estimated θCB were compared with 16 measured values of θTHR for 12 plant species in the eight soils. The variation in the θTHR and fraction of transpirable soil water (FTSW) with different plant species in the same soil and the same plant species in different soils were analyzed to compare effects of θCB and plant species on θTHR. Results The values of estimated θCB were nearly equal to those of measured θTHR. Highly significant (adjR2=0.9993,p<0.001) linear relationship was found between estimated θCB and measured θTHR with slope of 0.9938 and fixed y intercept of zero. In addition, the values of θTHR for different plant species were close to the same θCB in a soil. The θTHR values for the same plant species were different if θCB were different. Thus, the θTHR varied only with the θCB but not with the plant species. But the threshold FTSW varied due to plant species, not soil. Conclusions The estimated θCB can be considered equal to the measured θTHR. It is the θCB but not the plant that affects majorly the θTHR. Therefore, the θTHR can be predicted simply and quickly based on the estimation of θCB from θFC and Db.

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Section: Discussionmentioning

confidence: 99%

Prediction of soil-water thresholds for plant responses

Chi¹

2022

Preprint

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“…The soil moisture was brought to tensions of 5 to 17 atmospheres inclusive by the use of a pressure-membrane extractor with a cellulose membrane (Visking). Tensions above 17 atmospheres were obtained by mixing two soils of known moisture content to obtain the moisture associated with the desired tension, as reported by Sykes (1964). Varying amounts of water were added to different soil samples.…”

Section: Plant-environmental Interactionsmentioning

confidence: 99%

“…andSykes (1964) Peters (1957). grew corn seedlings in soils of different textures that had been brought to definite soil-moisture tension values.…”

mentioning

confidence: 99%

“…4 was conducted to obtain a coiq>arison of germinationin solutions and in soils. The soils used were selected because their moisture properties had been carefully determined with regard to the amount of water (%) in the soil at a given moisture tension(Sykes, 1964).Sykes found that there was considerably more moisture movement at high tensions ("crawl") in the Mumford soil than in the Clarion. It was considered that seed might germinate better at higher moisture tensions in this soil than in the Clarion if given enough time for this moisture crawl to be effective.…”

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Germination of seeds and growth of plants as affected by differing moisture tensions

Taylor

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The availability of soil moisture to plants

Cited by 2 publications

References 67 publications

Prediction of soil-water thresholds for plant responses

Prediction of soil-water thresholds for plant responses

Germination of seeds and growth of plants as affected by differing moisture tensions

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