Estimation of field capacity and wilting point of some New Zealand soils from their saturation percentages

Grewal, K. S.; Buchan, Graeme D.; Tonkin, Philip J.

doi:10.1080/01140671.1990.10428101

Cited by 43 publications

(29 citation statements)

References 13 publications

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“…This agrees with the results of Karkanis (1983), Dahiya et al (1988), and Grewal et al (1990). As we move from the moisture content at FC to progressively lower moisture contents (higher matrix potentials), Downloaded by [Florida International University] the correlations become consistently weaker.…”

Section: Resultssupporting

confidence: 91%

“…As we move from the moisture content at FC to progressively lower moisture contents (higher matrix potentials), Downloaded by [Florida International University] the correlations become consistently weaker. Contrary to the results of Dahiya et al (1988), but in agreement with those of Grewal et al (1990), the SP is not a good predictor of either total or readily available water. Their regression equations, shown in Table 3, still leave 41% and 76% of variability, respectively, in these properties unaccounted for.…”

Section: Resultscontrasting

confidence: 91%

“…This is contrary to the observations of Dahiya et al (1988) but agrees with the results of Grewal et al (1990) and Karkanis (1983). The predictive ability of the equations based on the untransformed SP values were tested on 25 independent soil samples.…”

Section: Resultssupporting

confidence: 79%

“…Karkanis (1983) obtained a strong linear relationship between FC (taken as the -33 kPa potential moisture content) and SP, and also between WP and SP. Grewal et al (1990), who also obtained similar relationships, used the -10 kPa potential moisture content for FC. However, the predictive ability of their models were not tested on independent data sets.…”

Section: Introductionmentioning

confidence: 83%

“…Attention has recently been focused on the possibility of estimating FC and WP from the saturation water percentage (SP) of soils which is a determinable parameter (Karkanis, 1983;Dahiya et al, 1988;Grewal et al, 1990). Karkanis (1983) obtained a strong linear relationship between FC (taken as the -33 kPa potential moisture content) and SP, and also between WP and SP.…”

Section: Introductionmentioning

confidence: 99%

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Estimating water retention and availability in Nigerian soils from their saturation percentage

Mbagwu

Mbah

1998

Communications in Soil Science and Plant Analysis

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A possibility of estimating the field capacity (FC), wilting point (WP), total available water (TAW), and readily available water (RAW) of soils was investigated from their saturation percentage (SP). Regression equations were obtained from the data from 166 Nigerian soils with wide variations in texture and other physico-chemical properties. The results showed a strong linear relationship between saturation percentage and the gravimetric percentage moisture contents at FC (r=0.972, P<0.001), and WP (r=0.949, P<0.001), but a weak linear relationship with TAW (r=0.771, P<0.01) and RAW (r=0.489, P<0.05). The regression equations calculated between these soil moisture constants and SP predicted the FC and WP of 25 independent soils very well, but were not good predictors of TAW and RAW. Reliable and satisfactory estimates of TAW were obtained by subtracting estimated WP from estimated FC, and of RAW by subtracting estimated moisture content at -100 kPa matrix potential from estimated FC. 913

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Section: Resultssupporting

confidence: 91%

Section: Resultscontrasting

confidence: 91%

Section: Resultssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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Estimating water retention and availability in Nigerian soils from their saturation percentage

Mbagwu

Mbah

1998

Communications in Soil Science and Plant Analysis

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Antioxidant Enzyme Activity and Lipid Peroxidation in Aporrectodea caliginosa Earthworms Exposed to Silver Nanoparticles and Silver Nitrate in Spiked Soil

Saleeb

Robinson

Cavanagh

et al. 2020

Enviro Toxic and Chemistry

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Silver nanoparticles (AgNPs) from industrial use, discharged via the land application of sewage sludge, are interacting with soil biota, including earthworms. In affected organisms, excessive production of reactive oxygen species can result in lipid peroxidation, shifting the balance between oxidants and antioxidants to cause oxidative stress. We determined selected lower‐tier biomarkers such as antioxidant responses and lipid peroxidation in Aporrectodea caliginosa earthworms exposed to soils spiked with AgNPs or silver nitrate (AgNO3). Aporrectodea caliginosa were exposed to AgNPs at 0 (control), 0.3, 3, 30, and 300 mg/kg or Ag+ (as AgNO3) at 0, 0.03, 0.3, 3, and 10 mg/kg in soil for 4 wk. At 1, 2, 3, and 4 wk, the activity of the antioxidant enzymes superoxide dismutase, catalase, glutathione peroxidase, glutathione S‐transferase, as well as lipid peroxidation (malondialdehyde content), increased as a function of concentration, with a much larger response for Ag+ than AgNPs. Given the likelihood of ever‐increasing AgNP concentrations in soil, where AgNPs can transform to ionic Ag (Ag+), our findings of antioxidant response to oxidative stress in a common indicator organism even at an environmentally realistic exposure concentration of 0.03 mg/kg demonstrate that AgNPs may affect soil fertility and, thus, agricultural production. Evaluating selected lower‐tier biomarkers offers a meaningful assessment of AgNPs and Ag+ effects on terrestrial earthworms. Environ Toxicol Chem 2020;39:1257–1266. © 2020 SETAC

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Water requirements of banana and papaya under different water table depths and soil types in the Lower Indus Basin of Pakistan

Gul,

Salam,

Ashraf

2023

Irrigation and Drainage

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The water requirements of banana and papaya, the two most important fruit crops of Pakistan, are not known because farmers continue to apply water even if the crop does not need it. In this study, the evapotranspiration (ET), groundwater contribution (GW) and crop coefficient (Kc) values of banana (1995–1999) and papaya (2013–2016) were determined under different water table depths (WTDs) and soil types using drainage‐type lysimeters. The WTDs were maintained at 1.50, 2.00 and 2.50 m from the ground surface by means of Mariotte bottles. The banana ET during the first year was between 1653 and 1992 mm with a GW contribution of 11–20%, whereas during the second to fifth years, it was between 2430 and 3023 mm with a GW contribution of 10–16%. The banana yield was in the range of 58,638–79,780 kg ha−1, and the water use efficiency (WUE) was between 2.65 and 3.31 kg m−3. The papaya ET was between 1478 and 1766 mm with a GW contribution of 7–18% at 1.50–2.50 m WTDs. The papaya yield was in the range of 61,184–83,004 kg ha−1 with a WUE of 4.13–4.70 kg m−3. Therefore, GW contribution is an important component of the water balance under shallow water table conditions and should be considered when devising irrigation scheduling for banana and papaya crops.

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Estimation of field capacity and wilting point of some New Zealand soils from their saturation percentages

Cited by 43 publications

References 13 publications

Estimating water retention and availability in Nigerian soils from their saturation percentage

Estimating water retention and availability in Nigerian soils from their saturation percentage

Antioxidant Enzyme Activity and Lipid Peroxidation in Aporrectodea caliginosa Earthworms Exposed to Silver Nanoparticles and Silver Nitrate in Spiked Soil

Water requirements of banana and papaya under different water table depths and soil types in the Lower Indus Basin of Pakistan

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