Effects of tillage alteration on soil water content, maize crop water potential and grain yield under subtropical humid climate conditions

With the evident climatic threats and the limitation of agronomic information for the bean crop, the use of agricultural models is necessary to broaden and disseminate technical knowledge of crop forecasting. The aim of this work was to evaluate the FAO AquaCrop model for bean crop under different levels of irrigation water in agrometeorological conditions of Northeastern Brazil at megatheramal and humid climate. The research was conducted in the period from 11/17/2015 to 02/01/2016. The experimental design was randomized block with four replicates. Treatments were composed of six levels of irrigation on the basis of crop evapotranspiration (ETc) fractions (25, 50, 75, 100, 125 and 150% of ETc). The irrigation effect was evaluated from biomass, dry matter and grain yield data that were observed and simulated using Aquacrop model. One linear meter of plants was collected every 10 days for biometric and destructive analyses. In addition, the soil water content simulated from model was compared with measurements performed by time domain reflectometry. The AquaCrop model was calibrated for common bean during the dry season (October to March) for the region in the 2015/2016 harvest season using experimental data for 100% of ETc. The accuracy of the calibration and validation model was evaluated based on the root mean square error (RMSE), Willmott’s index of agreement (d), correlation coefficient (r) and percentage deviation (D). The model showed good performance between observed and simulated values for soil water content, dry biomass accumulation and grain yield in several water conditions and can assist decision making and water management in irrigated crops.

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Detecting crop water requirement indicators in irrigated agroecosystems from soil water content profiles: An application for a citrus orchard

The Science of The Total Environment ◽

10.1016/j.scitotenv.2021.150492 ◽

2021 ◽

pp. 150492

Author(s):

Daniel A. Segovia-Cardozo ◽

Loris Franco ◽

Giuseppe Provenzano

Keyword(s):

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Water Requirement ◽

Crop Water Requirement ◽

Crop Water ◽

Citrus Orchard

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Effects of Changing Stomatal Width in A Red Pine Forest on Soil Water Content, Leaf Water Potential, Bole Diameter, and Growth

PLANT PHYSIOLOGY ◽

10.1104/pp.43.6.973 ◽

1968 ◽

Vol 43 (6) ◽

pp. 973-978 ◽

Cited By ~ 31

Author(s):

Neil C. Turner ◽

Paul E. Waggoner

Keyword(s):

Water Potential ◽

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Leaf Water Potential ◽

Pine Forest ◽

Leaf Water ◽

Red Pine

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Response of wheat to single short-term waterlogging during and after stem elongation

Australian Journal of Agricultural Research ◽

10.1071/ar9880011 ◽

1988 ◽

Vol 39 (1) ◽

pp. 11 ◽

Cited By ~ 10

Author(s):

WS Meyer ◽

HD Barrs

Keyword(s):

Grain Yield ◽

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Root Length ◽

Stem Elongation ◽

Stem Growth ◽

Yield Reduction ◽

Growth Stages ◽

Short Term

Transient waterlogging associated with spring irrigations on slowly draining soils causes yield reduction in irrigated wheat. Physiological responses to short-term flooding are not well understood. The aim of this experiment was to monitor above- and below-ground responses of wheat to single waterlogging events during and after stem elongation and to assess the sensitivity of the crop at these growth stages to flooding. Wheat (cv. Bindawarra) was grown in drainage lysimeters of undisturbed cores of Marah clay loam soil. A control treatment (F0) was well-watered throughout the season without surface flooding, while three others were flooded for 96 h at stem elongation (Fl), flag leaf emergence (F2) and anthesis (F3), respectively. Soil water content, soil O2, root length density, leaf and stem growth, apparent photosynthesis (APS), plant nutrient status and grain yield were measured. Soil water content increased and soil O2 levels decreased following flooding; the rate of soil O2 depletion increasing with crop age and root length. Leaf and stem growth and APS increased immediately following flooding, the magnitude of the increases was in the order F1 >F2>F3. A similar order existed in the effect of flooding which decreased the number of roots. Subsequently, leaf and stem growth decreased below that of F0 plants in F1, and briefly in F2. Decreases in APS of treated plants compared to F0 plants appeared to be due to their greater sensitivity to soil water deficit. There was no effect of flooding on grain yield. It is suggested that, while plant sensitivity to flooding decreased with age, flooding at stem elongation had no lasting detrimental effect on yield when post-flood watering was well controlled.

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Soil Water Content and Water Potential Relationships

Soil Physics Companion ◽

10.1201/9781420041651.ch3 ◽

2001 ◽

pp. 49-84 ◽

Cited By ~ 6

Author(s):

Jon Wraith ◽

Dani Or

Keyword(s):

Water Potential ◽

Water Content ◽

Soil Water ◽

Soil Water Content

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The impact of broadleaved woodland on water resources in lowland UK: I. Soil water changes below beech woodland and grass on chalk sites in Hampshire

Hydrology and Earth System Sciences ◽

10.5194/hess-9-596-2005 ◽

2005 ◽

Vol 9 (6) ◽

pp. 596-606 ◽

Cited By ~ 9

Author(s):

J. Roberts ◽

P. Rosier

Keyword(s):

Energy Balance ◽

Water Potential ◽

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Soil Water Potential ◽

Eddy Correlation ◽

Seasonal Differences ◽

Water Potential Measurements ◽

Shallow Soils

Abstract. The possible effects of broadleaved woodland on recharge to the UK Chalk aquifer have led to a study of evaporation and transpiration from beech woodland (Black Wood) and pasture (Bridgets Farm), growing in shallow soils above chalk in Hampshire. Eddy correlation measurements of energy balance components above both the forest and the grassland enabled calculation of latent heat flux (evaporation and transpiration) as a residual. Comparative measurements of soil water content and soil water potential in 9 m profiles under both forest and grassland found changes in soil water content down to 6 m at both sites; however, the soil water potential measurements showed upward movement of water only above a depth of about 2 m. Below this depth, water continued to drain and the soil water potential measurements showed downward movement of water at both sites, notwithstanding significant negative soil water potentials in the chalk and soil above. Seasonal differences occur in the soil water content profiles under broadleaved woodland and grass. Before the woodland foliage emerges, greater drying beneath the grassland is offset in late spring and early summer by increased drying under the forest. Yet, when the change in soil water profiles is at a maximum, in late summer, the profiles below woodland and grass are very similar. A comparison of soil water balances for Black Wood and Bridgets Farm using changes in soil water contents, local rainfall and evaporation measured by the energy balance approach allowed drainage to be calculated at each site. Although seasonal differences occurred, the difference in cumulative drainage below broadleaved woodland and grass was small.

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Relationships Among Water Potential Components, Relative Water Content, and Stomatal Resistance of Field-Grown Peanut Leaves1

Peanut Science ◽

10.3146/i0095-3679-11-1-10 ◽

1984 ◽

Vol 11 (1) ◽

pp. 31-35 ◽

Cited By ~ 12

Author(s):

J. M. Bennett ◽

K. J. Boote ◽

L. C. Hammond

Keyword(s):

Water Potential ◽

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Leaf Water Potential ◽

Relative Water Content ◽

Leaf Water ◽

Peanut Crop ◽

Relative Water ◽

Volumetric Soil Water

Abstract Limited data exist describing the physiological responses of peanut (Arachis hypogaea L.) plants to tissue water deficits. Detailed field experiments which accurately define the water status of both the plant and soil are required to better understand the effects of water stress on a peanut crop. The objectives of the present study were 1) to describe the changes in leaf water potential components during a drying cycle, and 2) to define the relationships among soil water content, leaf water potential, leaf turgor potential, relative water content, leaf-air temperature differential, and leaf diffusive resistance as water stress was imposed on a peanut crop. During a 28-day drying period where both rainfall and irrigation were withheld from peanut plants, midday measurements of the physiological parameters and volumetric soil water contents were taken concurrently. As soil drying progressed, water extraction from the upper soil depths was limited as soil moisture approached 0.04 m3m-3. Leaf water potentials and leaf turgor potentials of nonirrigated plants decreased to approximately −2.0 and 0 MPa, respectively, by the end of the experimental period. Leaf water potentials declined only gradually as the average volumetric soil water content in the upper 90 cm of soil decreased from 0.12 to 0.04 m3m-3. Further reductions in soil water content caused large reductions in leaf water potential. As volumetric soil moisture content decreased slightly below 0.04 m3m-3 in the upper 90 cm, leaf relative water content dropped to 86%, leaf water potential approached −1.6 MPa and leaf turgor potential decreased to 0 MPa. Concurrently, stomatal closure resulted and leaf temperature increased above air temperature. Osmotic potentials measured at 100% relative water content were similar for irrigated and nonirrigated plants, suggesting little or no osmotic regulation.

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Estimate Cotton Water Consumption from Shallow Groundwater under Different Irrigation Schedules

Agronomy ◽

10.3390/agronomy12010213 ◽

2022 ◽

Vol 12 (1) ◽

pp. 213

Author(s):

Guohua Zhang ◽

Xinhu Li

Keyword(s):

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Water Consumption ◽

Meteorological Factors ◽

Shallow Groundwater ◽

Soil Evaporation ◽

Groundwater Depth ◽

Crop Water ◽

Crop Water Consumption

Shallow groundwater is considered an important water resource to meet crop irrigation demands. However, limited information is available on the application of models to investigate the impact of irrigation schedules on shallow groundwater depth and estimate evaporation while considering the interaction between meteorological factors and the surface soil water content (SWC). Based on the Richards equation, we develop a model to simultaneously estimate crop water consumption of shallow groundwater and determine the optimal irrigation schedule in association with a shallow groundwater depth. A new soil evaporation function was established, and the control factors were calculated by using only the days after sowing. In this study, two irrigation scheduling methods were considered. In Method A, irrigation was managed based on the soil water content; in Method B, irrigation was based on the crop water demand. In comparison with Method B, Method A was more rational because it could use more groundwater, and the ratio of soil evaporation to total evapotranspiration was low. In this model, the interaction between meteorological factors and the SWC was considered to better reflect the real condition; therefore, the model provided a better way to estimate the crop water consumption.

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Soil water potential during different phenological phases of coffee irrigated by center pivot

Engenharia Agrícola ◽

10.1590/s0100-69162013000200006 ◽

2013 ◽

Vol 33 (2) ◽

pp. 269-278 ◽

Cited By ~ 1

Author(s):

Adão W. P. Evangelista ◽

Luiz A. Lima ◽

Antônio C. da Silva ◽

Carla de P. Martins ◽

Moisés S. Ribeiro

Keyword(s):

Water Potential ◽

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Irrigation Management ◽

Soil Water Potential ◽

Field Capacity ◽

Limiting Factor ◽

Center Pivot ◽

Phenological Phases

Irrigation management can be established, considering the soil water potential, as the limiting factor for plant growth, assuming the soil water content between the field capacity and the permanent wilting point as available water for crops. Thus, the aim of this study was to establish the soil water potential interval during four different phenological phases of coffee irrigated by center pivot. The experiment was set at the experimental area of the Engineering Department at the Federal University of Lavras, in Brazil. The coffee variety planted is designated as Rubi, planted 0.8 meters apart, with rows spaced 3.5 meters apart. The treatments corresponded to the water depths applied based on different percentages of Kc and reference evapotranspiration (ET0) values. Sensors were used to measure the soil water potential interval, installed 25 centimeters depth. In order to compare the results, it was considered as the best matric potential the one that was balanced with the soil water content that resulted in the largest coffee productivity. Based on the obtained results, we verified that in the phases of fruit expansion and ripening, the best results were obtained, before the irrigations, when the soil water potential values reached -35 and -38 kPa, respectively. And in the flowering, small green and fruit expansion phases, when the values reached -31 and -32 kPa, respectively.

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