AIR-FILLED POROSITY AND YIELD OF IRRIGATED COFFEE IN AN OXISOL

Q4 Environmental Science

IRRIGA Pub Date : 2021-12-22 DOI:10.15809/irriga.2021v26n4p758-773

J. L. M. Souza, S. L. K. Rosa, A. W. P. Evangelista, B. C. Gurski

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Abstract

Soil air-filled porosity (β) is directly related to the plants development and yield. Thus, the aim of this study was to evaluate how hourly aeration porosity (β) affects the productivity of irrigated coffee cultivated in an Oxisol in the region of Lavras, southeastern Brazil, in order to determine its ideal range. The experiment was conducted with the Rubi MG-1192 cultivar, spaced at 3.5 x 0.8 meters, in randomized blocks with six treatments and three replicates. The treatments consisted of applying percentages of the gross irrigation depth required (Li), being: non-irrigated, 60, 80, 100, 120 and 140% of Li. The soil matric potential (ym) in each treatment was measured with sensors, performing hourly readings at three depths (0.25, 0.50 and 0.75 m). The increase in gross irrigation depths provides a linear reduction of the average air-filled porosity in the soil cultivated with coffee. The T100 treatment showed a significant productivity increase, and from this value the gross irrigation depth showed a tendency to reduce coffee productivity and soil air-filled porosity. The ideal range of β between 0.152 and 0.163 m3 m-3 provided adequate aeration conditions and higher yield for coffee. Keywords: irrigated agriculture, productivity, soil aeration.

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氧溶胶中灌溉咖啡的充气孔隙率和产量

土壤充气孔隙度（β）直接关系到植物的发育和产量。因此，本研究的目的是评估每小时通气孔隙率（β）如何影响在巴西东南部拉夫拉斯地区的Oxisol中种植的灌溉咖啡的生产力，以确定其理想范围。该实验是用Rubi MG-1192品种进行的，间距为3.5 x 0.8米，随机分组，有六个处理和三个重复。处理包括施用所需总灌溉深度（Li）的百分比，即：非灌溉、Li的60%、80%、100%、120和140%。用传感器测量每个处理中的土壤基质电位（ym），在三个深度（0.25、0.50和0.75 m）进行每小时读数。总灌溉深度的增加提供了用咖啡种植的土壤中平均充气孔隙度的线性降低。T100处理的生产力显著提高，从这个值来看，总灌溉深度有降低咖啡生产力和土壤充气孔隙度的趋势。β在0.152和0.163 m3 m-3之间的理想范围为咖啡提供了足够的曝气条件和更高的产量。关键词：灌溉农业，生产力，土壤通气。

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来源期刊

IRRIGA Environmental Science-Water Science and Technology

CiteScore

0.70

自引率

0.00%

发文量

期刊介绍： A Revista IRRIGA é destinada a publicar trabalhos originais e que contribuam para o desenvolvimento cientifico da agricultura em português, espanhol, preferivelmente em inglês, nas áreas de Irrigação, Drenagem, Hidrologia, Agrometeorologia, Relações Solo-Água-Planta-Atmosfera e Reuso de Água. IRRIGA is a Scientific Journal edited by Agricultural Science College-UNESP, devoted to the publication of original scientific papers in English or Portuguese or Spanish, within the topics: Irrigation, Drainage, Agrometeorology, Hydrology, Waste Water and Soil-Water-Plant-Atmosphere Relationships.