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植物生态学报 2002
EFFECT OF FERTIGATION DEPTH ON DRY MATTER PARTITION AND WATER USE EFFICIENCY OF CORN
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Abstract:
Research has shown that plants are adversely affected by different wetting and fertilized zones. Most studies that have been done were limited to the effect of irrigation or fertilization. This study was done to detect the influence of various fertigation (fertilization irrigation) depths on the growth, dry matter partition, yield and water use efficiency of corn. Corn ( Zea mays L.)plants were established in the growth chamber in soil_filled polyvinyl chloride tubes, 67 cm long and with an outer diameter of 11 cm. Soil was well fertilized and wetted to field capacity at emergence when four treatments were imposed: 1) tubes were fertigated from the top soil (D 0); 2) tubes were fertigated on the depth of 20 cm from soil surface (D 20 ); 3) tubes were fertigated on the depth of 30 cm from soil surface (D 30 ); and 4) tubes were fertigated on the depth of 40 cm from soil surface (D 40 ). Soil moisture profiles, corn height, leaf area, shoot weight, root weight and yield were measured. The results show that the fertigation depths of 20 cm, 30 cm, 40 cm restrained shoot growth in early stages, strengthened the partition of roots in deep soil, and ensured the absorption and application of corn to water and nutrients, then raised water use efficiency. Under experimental conditions, the fertigation depth of 30 cm was optimal for corn. The reasons for these results, which lead to strenghen the absorption and application of corn to water and nutrient under different fertigation depths, and which raise water use efficiency under same conditions, are discussed.
