Number of workable days as a function of the water balance for planning mechanized sugarcane operations

IF 2.8 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES
Lígia Negri Corrêa, Andrea Onelia Rodriguez Roa, Vitor Hugo de Almeida Marrafon, Glauco de Souza Rolim
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Abstract

Knowing the number of workable days (NWD) with agricultural machinery during a crop is crucial to mitigate structural soil degradation in conditions of insufficient moisture. Although soil moisture is the most important, field planning often only involves precipitation. This study aimed to quantify NWD for the main sugarcane producing municipalities in Brazil across different seasons, considering the water balance. Two criteria were adopted to determine NWD: one includes days suitable for agricultural activities with daily precipitation less than 5 mm and soil water content between 40 and 90% of available water capacity, while the other only integrates precipitation (< 5 mm). Thirty years of daily climate data were collected for Brazilian locations to calculate the water balance. Cluster analysis was applied to group similar localities based on meteorological and water balance components. The study began with a statistical analysis of variability between groups and intragroup of meteorological and water balance elements. Subsequently, NWD maps were created for the past 30 years (characterization) and the past 10 years (planning), both for dry and rainy periods. A comparative analysis of the two criteria to account NWD was conducted. Over the last decade, significant drought trends led to an approximately 10-day increase in NWD nationwide during both dry and rainy seasons. The NWD criteria choice significantly impacted results, depending on the region of the country, reaching differences of up to 60 days within a total period of 90 days. The criterion considering soil water content tended to underestimate workable days but closely aligned with agricultural reality.

Abstract Image

规划甘蔗机械化作业时可作业天数与水平衡的函数关系
了解作物生长期间农业机械的可作业天数(NWD),对于在水分不足的条件下减轻土壤结构退化至关重要。虽然土壤水分最为重要,但田间规划往往只涉及降水。本研究旨在考虑水分平衡,量化巴西主要甘蔗生产城市在不同季节的净作田面积。确定 NWD 采用了两个标准:一个标准包括适合农业活动的天数,日降水量小于 5 毫米,土壤含水量介于可用水量的 40% 至 90% 之间;另一个标准仅包括降水量(< 5 毫米)。为计算水平衡,收集了巴西各地 30 年的日气候数据。应用聚类分析,根据气象和水平衡成分对相似地点进行分组。研究首先对组间和组内气象和水平衡要素的变异性进行了统计分析。随后,绘制了过去 30 年(特征描述)和过去 10 年(规划)的干旱和多雨时期的西北干旱带地图。对这两种核算西北干旱的标准进行了比较分析。在过去十年中,干旱趋势明显,导致全国旱季和雨季的 NWD 都增加了约 10 天。根据全国不同地区的情况,选择的干旱缺水标准对结果有很大影响,在 90 天的总周期内,差异可达 60 天。考虑土壤含水量的标准倾向于低估可工作天数,但与农业实际情况密切相关。
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来源期刊
Theoretical and Applied Climatology
Theoretical and Applied Climatology 地学-气象与大气科学
CiteScore
6.00
自引率
11.80%
发文量
376
审稿时长
4.3 months
期刊介绍: Theoretical and Applied Climatology covers the following topics: - climate modeling, climatic changes and climate forecasting, micro- to mesoclimate, applied meteorology as in agro- and forestmeteorology, biometeorology, building meteorology and atmospheric radiation problems as they relate to the biosphere - effects of anthropogenic and natural aerosols or gaseous trace constituents - hardware and software elements of meteorological measurements, including techniques of remote sensing
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