Abstract
Effects of fertigation strategies on water and nitrogen distribution under water storage pit irrigation for orchards
Highlights
Water shortage has become a serious global problem[1]
Ammonium was adsorbed into the soil and mostly remained near the pit wall
For the Water storage pit (WSP) irrigation, the contour plots were similar for the four fertigation strategies (N-W, W-N, W-N-W, and N-N)
Summary
Water shortage has become a serious global problem[1]. 70% of the North China (about 12 600 thousands hm2), being a major agricultural region, is irrigated, accounting for over 70% of the total water supply in North China[2]. Irrigation water (more than 40% of farmland) in the region is originated from groundwater[3]. A study showed that the average water table in North China has decreased by approximately 0.7 m/year in the last 20 years; in addition, water shortage is aggravated by the excess exploitation of groundwater[4,5]. The water shortage in North China threatens the sustainability of agricultural development in the region. Fruit trees have become a major economic crop in semiarid and arid areas of North China. In 2006, the area of orchards has reached 19×105 hm, which accounts for 1/3 in the world and represents more than sixfold increase in the past 25 years; orchard production has reached 261×105 t, which accounts for 37% of the world production
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