Evapotranspiração e coeficientes de cultura do milho em monocultivo e em consórcio com a mucuna-cinza, usando lisímetros de pesagem

Souza, Adilson Pacheco de; Lima, Márcio Emanoel de; Carvalho, Daniel Fonseca de

doi:10.5039/agraria.v7i1a802

Cited by 7 publications

(6 citation statements)

References 17 publications

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“…The ETc varied between 1.94 mm day -1 to 5.68 mm day -1 , and presented a total of 300.54 mm, measured by weighing lysimeters in a conventional tillage system. In a study with the hybrid Eldorado (115 days of cycle) in the municipality of Seropédica-RJ, Souza et al (2012) determined ETc by weighing lysimetry and obtained a cumulative total of 394.00 mm. These ETc values are close to those obtained in this study; however the regions present influences of the different edaphoclimatic conditions.…”

Section: Resultsmentioning

confidence: 99%

Effect of Soil Coverage on Dual Crop Coefficient of Maize in a Region of Mato Grosso, Brazil

Andréa¹,

Vieira²,

Dallacort³

et al. 2019

JAS

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With the objective of determining maize’s specific water requirements in different soil cover conditions in a Cerrado region of Mato Grosso, Brazil, this study used the dual’s crop coefficient (Kc dual) approach, according to FAO methods. An experiment was carried out in 2016, with three treatments: without vegetation soil cover; soil cover of 4 t ha-1 and soil cover of 8 t ha-1 dry matter of brachiaria grass. The used methodology accounts for crop’s transpiration component (through its basal coefficient, Kcb) and soil evaporation component (through its coefficient, Ke), which were determined for initial, intermediate and final phases of crop development. Experiments were carried in lysimeters to determine crop’s evapotranspiration, and in microlysimeters to determine soil evaporation. Crop’s transpiration, on three soil coverage treatments, showed overall highest values for the treatment with greater coverage (Kcb maximum values of 0.88, 1.00 and 1.03 from the lowest to greater soil coverage), while between crop’s phases, coefficient values were always higher at the intermediate stage, presenting decreases with crop senescence. Soil evaporation was highest on treatment without coverage in all crop’s stages (Ke = 0.37-0.78) and lowest in the treatment with greater coverage (Ke = 0.11-0.35). Yields were higher on treatments with coverage (9929.18 and 9939.52 kg ha-1 for treatments with 4 and 8 t ha-1) and lower when cultivated in soil without cover (8264.67 kg ha-1). Despite relatively higher crop’s transpiration with greater soil coverage, this treatment was identified as the best management option in the assessed tropical region of Brazilian Cerrado, in terms of rational use of water, due to lowest losses through evaporation, as also providing the highest grain yields.

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Section: Resultsmentioning

confidence: 99%

Effect of Soil Coverage on Dual Crop Coefficient of Maize in a Region of Mato Grosso, Brazil

Andréa¹,

Vieira²,

Dallacort³

et al. 2019

JAS

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“…Grain yields lower than expected may be related to the water deficit observed in the crop years, with rainfall below the historical average in some periods, especially in the 2011/2012 crop year. In intercropped crops, there is an increase in plant density and leaf area, which results in increased evapotranspiration and water demand, potentiating the effect of water deficit (Allen et al, 2006;Souza et al, 2012). Morphological differences and forage extraction capacity may have contributed to water competition between grasses and soybean.…”

Section: Resultsmentioning

confidence: 99%

Establishment of perennial forages intercropped with soybean for integrated crop-livestock systems

Machado

Cecato

Comunello

et al. 2017

Pesq. agropec. bras.

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-The objective of this work was to evaluate soybean (Glycine max) grain yield and the establishment of perennial intercropped forages. Soybean was evaluated in sole crop and intercropped with the following forages: Megathyrsus maximus, Aruana and BRS Tamani cultivars; Urochloa brizantha, Xaraés, BRS Piatã, and BRS Paiaguás cultivars; U. decumbens; and U. ruziziensis. A randomized complete block design was used, with seven replicates, in the 2011/2012 and 2012/2013 crop seasons. In the intercropped system, the forages were sown 21 and 14 days after soybean emergence, in the first and second crop seasons, respectively. Grain yield did not differ for soybean in sole crop or intercropped, except for soybean + U. ruziziensis and soybean + 'BRS Paiaguás', which were less productive in the second year of evaluation. The 'BRS Tamani' forage was the most suited for intercropping with soybean, considering its morphological characteristics and its low competition potential. Soybean intercropped with perennial forages contributes to suppress weed growth and, overall, does not compromise soybean yield.

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“…The methodology used to determine water consumption (evapotranspiration) that has been used in Brazil with the high precision weighing lysimeter being the most used model in studies of annual cultures [4,5,6,7,8]. From the values of evapotranspiration, the values of the crop coefficient (Kc) are determined, which is the relationship between the evapotranspiration of the culture and the reference evapotranspiration [9].…”

Section: Introductionmentioning

confidence: 99%

“…The use of soil coverage, in addition to changing the soil-water ratio, maintains moisture for a longer time, reducing soil water loss through evaporation [13]. Thus, the soil coverage can contribute to reduce the frequency of irrigation, in addition to enhance productivity [5,14].…”

Section: Introductionmentioning

confidence: 99%

Influence of Soil Coverage on Evapotranspiration and Dual Crop Coefficients on Soybean

Barbieri

Freitas

Dallacort

et al. 2020

JEAI

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Crop coefficient (Kc) study is the main tool used to determine the plant water consumption enabling irrigation management. The dual Kc is related to the evaporation coefficient of water from the soil (Ke), therefore, the objective of the work was to evaluate the influence of the soil coverage, in the variability of the crop evapotranspiration (ETc) of soybean and the dual Kc. The Kc values were determined by the ratio between ETc and ETo (reference evapotranspiration). ETo was estimated using the methodology proposed by Penman-Monteith FAO-56. The ETc values were obtained by the water input and output ratio of the weighing lysimeters system for the culture development phases established as initial; development; intermediate and final. The culture presented a cycle of 118 days for both treatments; the volume of the water precipitated and supplied by irrigation was 786.4 and 89 mm, respectively. The water consumption determined by ETc during the crop cycle was 699.10; 672.57; 649.06; 724.02; 643.46 and 638.12 mm, respectively for levels 0; 2; 4; 6; 8 and 10 t ha-1 of the dry mass of Brachiaria. The average dual Kc obtained was 1.60; 1.48; 1.40; 1.53; 1.42 and 1.47, respectively for coverings and a reduction in Kc was observed for treatments with soil coverage. Yield and development of the root system, were increase on soil coverage of 2 and 4 t ha-1.

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Evapotranspiração e coeficientes de cultura do milho em monocultivo e em consórcio com a mucuna-cinza, usando lisímetros de pesagem

Cited by 7 publications

References 17 publications

Effect of Soil Coverage on Dual Crop Coefficient of Maize in a Region of Mato Grosso, Brazil

Effect of Soil Coverage on Dual Crop Coefficient of Maize in a Region of Mato Grosso, Brazil

Establishment of perennial forages intercropped with soybean for integrated crop-livestock systems

Influence of Soil Coverage on Evapotranspiration and Dual Crop Coefficients on Soybean

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