Crop coefficient for irrigated beans derived using three reference evaporation methods

Medeiros, Gerson Araújo de; Arruda, Flávio Bussmeyer; Sakai, Emı́lio

doi:10.1016/j.agrformet.2005.11.010

Cited by 33 publications

(18 citation statements)

References 22 publications

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“…Compared to monoculture systems, in intercropping systems, crop yield improvement may be due to the greater dry matter production in maize resulting from better use of biophysical resources in strip intercropping treatments (De Medeiros, Arruda, & Sakai, 2005). Some research found that increased light capture, more efficient light use, or a combination of these two were the main reason for the greater productivity of intercropped systems relative to sole crops (Keating & Carberry, 1993;Wang et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

Nitrogen uptake and transfer in a soybean/maize intercropping system in the karst region of southwest China

Zhang

Zeng

Zou

et al. 2017

Ecology and Evolution

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Nitrogen (N) deficiency occurs in over 80% of karst soil of southwest China, which restricts regional agricultural production. To test whether N fixed by legumes becomes available to nonfixing companion species, N fluxes between soybean and maize under no, partial, and total restriction of root contact were measured on a karst site in southwest China. N content and its transfer between soybean and maize intercrops were explored in a 2‐year plot experiment, with N movement between crops monitored using 15N isotopes. Mesh barrier (30 μm) and no restrictions barrier root separation increased N uptake of maize by 1.28%–3.45% and 3.2%–3.45%, respectively. N uptake by soybean with no restrictions root separation was 1.23 and 1.56 times higher than that by mesh and solid barriers, respectively. In the unrestricted root condition, N transfer from soybean to maize in no restrictions barrier was 2.34–3.02 mg higher than that of mesh barrier. Therefore, it was implied that soybean/maize intercropping could improve N uptake and transfer efficiently in the karst region of southwest China.

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Section: Discussionmentioning

confidence: 99%

Nitrogen uptake and transfer in a soybean/maize intercropping system in the karst region of southwest China

Zhang

Zeng

Zou

et al. 2017

Ecology and Evolution

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“…clipped grass or alfalfa). The K c serves as an aggregation of the physical and physiological differences between the crop‐specific surface and reference surface, and plays an essential role in practical applications (Pereira et al ., ; Allen, ; De Medeiros et al ., ). Therefore, investigating change patterns of K c and proposing a simply practical approach to estimate K c are important in developing the based‐ ET irrigation scheduling.…”

Section: Introductionmentioning

confidence: 99%

Variations of crop coefficient and its influencing factors in an arid advective cropland of northwest China

Ding

Tong

et al. 2014

Hydrol. Process.

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Understanding the variation and magnitude of crop coefficient (Kc) is important for accurate determination of crop evapotranspiration and water use. In this study, we calculated Kc in an irrigated maize field with ground mulching by eddy covariance evapotranspiration measurements during the whole growing periods in 2009 and 2010 in an arid region of northwest China. A semi‐empirical practical approach for estimating Kc was proposed by introducing the dynamic fraction of canopy cover and incorporating the effect of leaf senescence as a function of days after sowing. The contribution of arid advection of sensible heat resulting from irrigation to Kc and the response of Kc to canopy conductance (Gc) were investigated. The averaged values of daily Kc were lower than typical values obtained previously without mulching due to decreasing effect of mulching on Kc, with 0.82 and 0.80 for the 2 years, respectively. The maximum average Kc occurred at the heading stage, with 1.21 and 1.04 for the 2 years, respectively. The difference of Kc was attributed to the difference of leaf area index. The semi‐empirical practical approach could well estimate the variations of Kc, thus could be a robust and useful tool for the practical users and water managers. The contributions to daily Kc from the arid advection were 4.4–28.0% of the measured Kc. The Gc had stronger control on daily Kc at the early and later stages than at the middle stage. When Gc, leaf area index and relative soil extractable water were lower than the respective threshold values of 20 mm s−1, 3.0 m2 m−2 and 0.5, the daily Kc increased significantly with the increase of the three factors, and almost remained constant when the three factors were beyond the threshold values. These results are helpful for quantifying contributions of individual factors to Kc, and subsequently improving water management practices according to Kc. Copyright © 2014 John Wiley & Sons, Ltd.

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“…FAO assigns Kc for various crops under conditions of sub-humid climate, as for example potato (Solanum tuberosum L.). However, these coefficients need to be adjusted according to local conditions, since the crop coefficients recommended by FAO do not consider the variability of climate, cultural practices and soil and water management (MEDEIROS et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Evapotranspiration and crop coefficient for potato in organic farming

et al. 2013

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The aim of this study was to quantify the water consumption and the crop coefficients (Kc) for the potato (Solanum tuberosum L.), in Seropédica, Rio de Janeiro (RJ), Brazil, under organic management, and to simulate the crop evapotranspiration (ETc) using the Kc obtained in the field and the ones recommended by the Food and Agriculture Organization (FAO). The water consumption was obtained through soil water balance, using TDR probes installed at 0.15m and 0.30m deep. At the different stages of development, the Kc was determined by the ratio of ETc and reference evapotranspiration, obtained by Penman-Monteith FAO 56. The crop coefficients obtained were 0.35, 0.45, 1.29 and 0.63. The accumulated ETc obtained in the field was 109.6 mm, while the ETc accumulated from FAO's Kc were 142.2 and 138mm, respectively, considering the classical values and the values adjusted to the local climatic conditions. The simulation of water consumption based on meteorological data of historical series from 1961 to 2007 provided higher value of ETc when compared with the one obtained in the field. From the meteorological data of historical series, it was observed that the use of Kc recommended by FAO may overestimate the amount of irrigation water by 9%, over the same growing season.

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Crop coefficient for irrigated beans derived using three reference evaporation methods

Cited by 33 publications

References 22 publications

Nitrogen uptake and transfer in a soybean/maize intercropping system in the karst region of southwest China

Nitrogen uptake and transfer in a soybean/maize intercropping system in the karst region of southwest China

Variations of crop coefficient and its influencing factors in an arid advective cropland of northwest China

Evapotranspiration and crop coefficient for potato in organic farming

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