Abstract: The experimentation of interplant Astragalus adsurgens in Armeniaca vulgaris×A. sibirica orchard had been done in loess hilly and gully region of northern Shaanxi. The moisture, organic matter, total N, total P, available N, available P, available K of 0-500 cm soil layers and the growth status of A.vulgaris×A. sibirica of clean tillage, interplant six years, interplant four years and interplant two years had been determined. The results showed that the soil moisture of interplant As. adsurgens increased in 0-100 cm soil layer in autumn, but the soil moisture of the treatments of interplant As. adsurgens reduced significantly in springtime, summertime and autumn in 0-500 cm soil layer, and the soil moisture reduced obviously as interplant years increasing. In 0-100 cm soil layers, organic matter and total N of the treatments of interplant As. adsurgens were higher than clean tillage, and increased obviously as interplant years increasing, but the soil organic matter and total N under 100 cm soil layers weren^,t significant difference than clean tillage. Between the treatments of interplantAs. adsurgens and clean tillage, soil total P didnt have significant difference. Soil available N, available P and available K of the treatments of interplant As. adsurgens were significant lower than clean tillage, soil available N reduced from 0 cm to 500 cm soil layers, soil available P and available K reduced from 0 cm to 300 cm soil layers, and the content of available N, available P and available K in soil decreased obviously as interplant years increasing. The A. vulgaris×A. sibirica growth of the treatments of interplant As. adsurgens were significant weaker, and fruit set percentage and the almond yield were significant lower than clean tillage. Between As. adsurgens andA. vulgaris×A. sibirica there were a contention for water and nutrient, A. vulgaris×A. sibirica orchard wasn^,t suitable interplant As. adsurgens in loess hilly and gully egion.

Key words: Armeniaca vulgaris×A. sibirica, Astragalus adsurgens, Interplant, Soil moisture, Soil nutrient, Growth status