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Agronomy Journal

The effect of irrigation regime on the soil-water suction, the salinity of the soil solution, and the yields of tomato (Lycopersicum esculantum far. 675) and bell pepper (Capsicum frutescens far. 'Maor') in a gypsiferous-sodic soil was studied. For each of the two crops, three different amounts of water (in terms of pan efaporation) at two different irrigation frequencies (daily irrigation and irrigation efery 3 days) were applied. The different irrigation regimes resulted in different soil water suction and salinity profiles, each of which can be characterized by a time aferage and the fariance about this aferage. Aferage (onr time) soil water potential (Vi) increased as both the amount of irrigation water (Q') and the irrigation frequency (I) increased. For a gifen I, the Yi-Q' relationships can be described by a hyperbolic function. In the gypsiferous-sodic soil used, the salinity of the soil solution was highly correlated with the exchangeable Na of the soil, which, in turn, was reduced with added irrigation water. Relatife yields, Y, of the two crops were linearly dependent on the fariance of the soil-water potential, independent of the irrigation regime. This implies that the yield-soil-water potential relationship can be described by a quadratic function. As opposed to the unique Y -Vi relationships, theY -Q' relationships depend on the irrigation frequency. For a ginn Q', yields of both crops obtained under daily irrigation were higher than the yields obtained under irrigation once in 3 days. Highest fruit yields were 126.1 Mg/ha of tomatoes and 62.7 Mg/ha of bell pepper; the respectife amounts of irrigation water were 1,013 and 2,164 mm (109%) and 160% of the efaporation from a Class A pan).

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Crop Yield – Irrigation Relationships in a Gypsiferous‐Sodic Soil‏
75
Crop Yield – Irrigation Relationships in a Gypsiferous‐Sodic Soil‏

The effect of irrigation regime on the soil-water suction, the salinity of the soil solution, and the yields of tomato (Lycopersicum esculantum far. 675) and bell pepper (Capsicum frutescens far. 'Maor') in a gypsiferous-sodic soil was studied. For each of the two crops, three different amounts of water (in terms of pan efaporation) at two different irrigation frequencies (daily irrigation and irrigation efery 3 days) were applied. The different irrigation regimes resulted in different soil water suction and salinity profiles, each of which can be characterized by a time aferage and the fariance about this aferage. Aferage (onr time) soil water potential (Vi) increased as both the amount of irrigation water (Q') and the irrigation frequency (I) increased. For a gifen I, the Yi-Q' relationships can be described by a hyperbolic function. In the gypsiferous-sodic soil used, the salinity of the soil solution was highly correlated with the exchangeable Na of the soil, which, in turn, was reduced with added irrigation water. Relatife yields, Y, of the two crops were linearly dependent on the fariance of the soil-water potential, independent of the irrigation regime. This implies that the yield-soil-water potential relationship can be described by a quadratic function. As opposed to the unique Y -Vi relationships, theY -Q' relationships depend on the irrigation frequency. For a ginn Q', yields of both crops obtained under daily irrigation were higher than the yields obtained under irrigation once in 3 days. Highest fruit yields were 126.1 Mg/ha of tomatoes and 62.7 Mg/ha of bell pepper; the respectife amounts of irrigation water were 1,013 and 2,164 mm (109%) and 160% of the efaporation from a Class A pan).

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