Abstract:Com o aumento do preço da terra e da demanda por álcool/açúcar tem-se buscado o aumento da produtividade da cultura da cana e o aproveitamento de novas áreas para a produção, as quais podem necessitar de drenagem. Com isso, tornam-se importantes estudos de dimensionamento de sistemas de drenagem agrícola e sua avaliação econômica. O trabalho teve como objetivo avaliar economicamente, com o auxílio do modelo SISDRENA, a melhor combinação entre profundidade e espaçamento de valas, implantados em três tipos de so… Show more
“…For sugarcane grown in clay soil, Askar et al [45] suggested drain depths of 1.4 to 1.8 m and spaces between drains ranging from 25 to 40 m. In clay-loam soil the drain pipes should be installed at spaces of between 55 and 70 m, with a corresponding drain depth between of 1.4 and 1.8 m. On the other hand" various authors [65,70,72,73] have determined that the best spaces of drains that presented the highest relative yield of sugarcane for clay loam, clay, silt clay loam soils were 60 m, 40 m and 30 m, respectively.…”
Section: Discussionmentioning
confidence: 99%
“…where Y (decimal) represents the yield loss, estimated using the production function proposed by [90], which is dependent on the evapotranspiration deficit. Finally, the total relative yield (YT, decimal) is determined according to the methodology provided by the authors of [91], considering together the effects of water excess and water deficit, calculated by multiplying YRW (decimal) and YRD (decimal) More information is given in [64][65][66]70,72].…”
Section: Environmental Datamentioning
confidence: 99%
“…Therefore, using the methodology proposed by various authors [65,70,72,73] the water balance in the root zone of sugarcane was determined using the available water data in each proposed scenario (Soil 1, Soil 2 and Soil 3, see Section 2.3). The geometric parameters of the drainage system used in the simulations were: spacing between drains ranging from 10 to 100 m, with intervals of 10 m; installation depths of 1.2, 1.4 and 1.6 m; initial depth of the water table at 50% of the installation depth; the depth of the impermeable layer at 5 m; and the effective radius of the drains at 0.05 m. For the simulations, the cultivation of sugarcane, with a one-year cycle, was assumed to be planted in January, with three stages of development.…”
Agricultural land drainage is an instrument for growing production and a tool for the conservation of land resources. The performance of land drainage systems is thus critical for achieving sustainable agricultural production Recently, many types of software have been developed in this field for modeling and simulating the performance of these systems. SISDRENA is a simulation model of the performance of underground drainage systems. The main objectives of this paper are to simulate different combination of depths and spaces between drains and to analyze their impact on potential sugarcane productivity in the western plains of Venezuela using a land drainage system model. Therefore, three climatic scenarios were defined by annual precipitation: dry years (25% below average), normal (mean) and humid (75% above average). The scenarios were implemented in three different soil types: sandy loam, loam and silt loam, with a hydraulic conductivity of 0.19, 0.26 and 0.04 m day−1, respectively. The simulation of the yield related to soil deficit (YRD) and water stress (YRW) indicated that the highest yields were reached for the larger spacing between drains and the high conductivity hydraulic of soils. In relation to the average relative productivity (YT), it was shown that in soils with a greater water retention capacity there is an inversely proportional relationship between the spacing between drains and the productivity. We concluded that in order to reach the maximum sugarcane yield, the effect of hydraulic conductivity is more important than the changes in the precipitation pattern.
“…For sugarcane grown in clay soil, Askar et al [45] suggested drain depths of 1.4 to 1.8 m and spaces between drains ranging from 25 to 40 m. In clay-loam soil the drain pipes should be installed at spaces of between 55 and 70 m, with a corresponding drain depth between of 1.4 and 1.8 m. On the other hand" various authors [65,70,72,73] have determined that the best spaces of drains that presented the highest relative yield of sugarcane for clay loam, clay, silt clay loam soils were 60 m, 40 m and 30 m, respectively.…”
Section: Discussionmentioning
confidence: 99%
“…where Y (decimal) represents the yield loss, estimated using the production function proposed by [90], which is dependent on the evapotranspiration deficit. Finally, the total relative yield (YT, decimal) is determined according to the methodology provided by the authors of [91], considering together the effects of water excess and water deficit, calculated by multiplying YRW (decimal) and YRD (decimal) More information is given in [64][65][66]70,72].…”
Section: Environmental Datamentioning
confidence: 99%
“…Therefore, using the methodology proposed by various authors [65,70,72,73] the water balance in the root zone of sugarcane was determined using the available water data in each proposed scenario (Soil 1, Soil 2 and Soil 3, see Section 2.3). The geometric parameters of the drainage system used in the simulations were: spacing between drains ranging from 10 to 100 m, with intervals of 10 m; installation depths of 1.2, 1.4 and 1.6 m; initial depth of the water table at 50% of the installation depth; the depth of the impermeable layer at 5 m; and the effective radius of the drains at 0.05 m. For the simulations, the cultivation of sugarcane, with a one-year cycle, was assumed to be planted in January, with three stages of development.…”
Agricultural land drainage is an instrument for growing production and a tool for the conservation of land resources. The performance of land drainage systems is thus critical for achieving sustainable agricultural production Recently, many types of software have been developed in this field for modeling and simulating the performance of these systems. SISDRENA is a simulation model of the performance of underground drainage systems. The main objectives of this paper are to simulate different combination of depths and spaces between drains and to analyze their impact on potential sugarcane productivity in the western plains of Venezuela using a land drainage system model. Therefore, three climatic scenarios were defined by annual precipitation: dry years (25% below average), normal (mean) and humid (75% above average). The scenarios were implemented in three different soil types: sandy loam, loam and silt loam, with a hydraulic conductivity of 0.19, 0.26 and 0.04 m day−1, respectively. The simulation of the yield related to soil deficit (YRD) and water stress (YRW) indicated that the highest yields were reached for the larger spacing between drains and the high conductivity hydraulic of soils. In relation to the average relative productivity (YT), it was shown that in soils with a greater water retention capacity there is an inversely proportional relationship between the spacing between drains and the productivity. We concluded that in order to reach the maximum sugarcane yield, the effect of hydraulic conductivity is more important than the changes in the precipitation pattern.
“…Within this context, the SISDRENA model simulates the performance of one-dimensional drainage systems (Miranda et al, 1998). Other researchers have used this model for different scientific questions (Silva et al, 2005;Duarte et al, 2002;Mingoti et al, 2006). However, there is a lack of research on using this model to simulate future scenarios of climate change.…”
“…Empirically adopting drainage systems is often responsible for sugarcane failure. Thus, for the use of artificial drainage, studies are required with values representative of the physical-water and geometric properties of the soil profile, as well as physiological (MINGOTI et al, 2006). Studies of this nature with ratoon crops are still non-existent; the few we have are with cane plant, such as those by (TAVARES et al, 2017a, b;TAVARES et al, 2018a, b).…”
Soil water logging reduces the availability of oxygen to the roots of the plants, which makes necessary an efficient drainage system for correction. Thus, the objective of this study was to evaluate the tolerance of sugarcane in flooded crop with different velocities of lowering the groundwater in three stages of ratoon sugarcane development. The experiment was carried out in a randomized complete block design (3 x 5 + 1), with three developmental stages (44, 210 and 305 days after planting) and five groundwater falling velocities (30 cm in 3, 6, 9, 12 and 15 days) and the control (irrigation without flooding the soil). There was a significant effect for groundwater retraction velocities and evaluation periods for leaf area (LA) and leaf area index. The treatments P1V4 and P2V3 presented the highest LAs (0.91 m²). The first sugarcane ratoon was tolerant to soil waterlogging at different stages of development and to different groundwater falling velocities, with no major losses in plant development and productivity, however, for total recoverable sugar cane ratoon was more sensitive when the flood occurred in the regrowth stage.
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