Effect of soil water status and mulching on N 2 O and CH 4 emission from lowland rice field in China

2004 ◽  
Vol 39 (3) ◽  
pp. 215-217 ◽  
Author(s):  
Y. C. Xu ◽  
Q. R. Shen ◽  
M. L. Li ◽  
K. Dittert ◽  
B. Sattelmacher
Keyword(s):  
Soil Water ◽  
Rice Field ◽  
Water Status ◽  
Lowland Rice ◽  
Soil Water Status

Drought-stress responses of two lowland rice cultivars to soil water status

1996 ◽  
Vol 46 (1-3) ◽  
pp. 21-39 ◽  
Author(s):  
M.C.S. Wopereis ◽  
M.J. Kropff ◽  
A.R. Maligaya ◽  
T.P. Tuong
Keyword(s):  
Drought Stress ◽  
Soil Water ◽  
Stress Responses ◽  
Water Status ◽  
Lowland Rice ◽  
Rice Cultivars ◽  
Soil Water Status

Optimisation of fertigation scheduling based on indicators of soil water status in melon growing in semi-arid areas

2021 ◽  
Author(s):  
Sandra María Martínez-Pedreño ◽  
Pablo Berríos ◽  
Abdelmalek Temnani ◽  
Susana Zapata ◽  
Manuel Forcén ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Soil Water ◽  
Water Status ◽  
Total Phenolic ◽  
Crop Water ◽  
Soil Water Status ◽  
Significant Difference ◽  
Irrigation Time ◽  
Crop Cycle ◽  
Semi Arid

<p>In water scarcity areas, it is necessary not only reducing the water applied as much as possible, but also optimizing nutrients application to avoid soil salinization and aquifers pollution because of leaching bellow the root zone. Increasing the sustainability of fertirrigation needs technology to adjust the irrigation time, knowing more precisely the soil water retention capacity and facilitate water absorption by the crop. The aim of this trial was to establish protocols for sustainable fertirrigation in melon crop under semi-arid conditions, both at an environmental and economic level, based on the use of soil water status indicators measured by sensors that allow us to increase the irrigation water use efficiency. Two irrigation treatments were established: i) Control (CTL), irrigated to satisfy the water requirements of the crop, according to the farmer's criterion throughout the crop cycle and ii) DI, deficit irrigation, irrigated to allow a maximum soil water depletion of 20%, with respect to field capacity throughout the crop cycle, from sensors located below the 20 cm depth horizon, in order to limit water leaching into the soil. An experimental design was established with 4 repetitions per treatment distributed at random, with 5 plants per repetition. Macro and micronutrients concentration of soil solution, leaves and fruits were analysed. The crop water status was determined fortnightly by measurements taken at solar midday of stem water potential, net photosynthesis, evapotranspiration rate and leaf conductance. Whereas photosynthetically active radiation absorption, basal stem and fruit equatorial diameters were determined to estimate plant and fruit growth. The physical (longitudinal and equatorial fruit diameters, fruit weight, pulp width and firmness) and chemical (titratable acidity, pH and total soluble solid of the juice, total phenolic content, total antioxidant capacity and total ascorbic acid) characteristics of harvested fruits were determined. Total water applied in CTL treatment was 3,254 m<sup>3</sup> ha<sup>-1</sup> throughout the crop cycle whereas DI received 2,284 m<sup>3</sup> ha<sup>-1</sup>, a 29.8% lower. In both cases, the volume of water applied was lower than recommended by FAO. The regulation of the irrigation time in the DI treatment respect to the CTL promoted a reduction of the soil water content from 30 cm depth, mitigating the water loss below the root system, along with a lower contribution of nutrients, around of 43, 41.8 and 22% of N, P and K, respectively, and less salinization of the soil profile. No significant difference between treatments was detected in the concentration of these nutrients at leaf level. No difference was observed at harvest, with 0.53 and 0.59 g fruit g<sup>-1</sup> total dry mass of harvest index in CTL and DI, respectively. Fruit quality was not negatively affected in DI but improved since ascorbic acid was higher. This means that DI treatment not only did not negatively affect the crop water status and the amount and quality of the yield, but also improved its biochemical quality while reducing water and nutrients use and leaching.</p>

Warming effects on methane fluxes differ between two alpine grasslands with contrasting soil water status

2020 ◽  
Vol 290 ◽  
pp. 107988
Author(s):  
Fei Li ◽  
Guibiao Yang ◽  
Yunfeng Peng ◽  
Guanqin Wang ◽  
Shuqi Qin ◽  
...  
Keyword(s):  
Soil Water ◽  
Water Status ◽  
Alpine Grasslands ◽  
Soil Water Status ◽  
Methane Fluxes
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