Link
Informazioni sull’irrigazione delle piantagioni di riso
Risorse naturali e agricole
Food and Agriculture Organization of the United Nations (FAO)
United States Department of Agriculture (USDA)
University of Nebraska - Lincoln
Agricultural Research and Development Center (ARDC)
University of Nebraska - Lincoln
Institute of Agriculture and Natural Resources
Valley perno sul riso
in Brasile
Un pivot Valley in una piantagione di caffè
in Brasile