NATURAL WATER SUPPLY AND FERTILIZATION INTERACTIONS ON CROPS YIELD IN FRAGILE AGROECOSYSTEM

摘要

magnesium 140 (MgCO_3) after 1980. Averaged rainfall quantities over many years, in the experimental years, during phenological phases in the many years, and in the experimental years for rye were 567, 497, 509, 452 mm, and for winter wheat 586, 509, 518 and 467 mm. Rainfall deviations from the many years's average in the experimental years and during the phenological phases of potato were -3%, -13% and of triticale 2% and -3%. During the vegetation period, the relationships between rainfall quantity, nutrition (N, P, K, Ca, Mg), and yield were characterized by polynomial correlations (Rye, control: R = 0.99; N: R = 0.84; NP: R = 0.84; NK: R = 0.91; NPK: R = 0.85; NPKMg: R = 0.65. Potato, control: R = 0.98; N: R = 0.95; NP: R = 0.96; NK: R = 0.95; NPK: R = 0.98; NPKMg: R = 0.96. Winter wheat, control: R = 0.59; N: R = 0.57; NP: R = 0.76; NK: R = 0.54; NPK: R = 0.67; NPKMg: R = 0.71. Triticale, control: R = 0.35; N: R = 0.28; NP: R = 0.47; NK: R = 0.37; NPK: R = 0.63; NPKCa: R = 0.67; NPKMg: R = 0.67; NPKCaMg: R = 0.62). Maximum yields for rye: 4.0 t·ha~(-1), potato: 21.0 t·ha~(-1), winter wheat: 3.4 t·ha~(-1), and triticale: 5.0-6.0 t·ha~(-1) were observed when the respective natural rainfall amount was in the range of 430-500, 280-330, 449-495 and 550-600 mm. At rainfall amounts above and below these ranges, there was a corresponding quadratic reduction in the yield.