Distribution and storage characterization of soil solution for drip irrigation
Distribution and storage characterization of soil solution for drip irrigation
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DOI：
10.1007/s00271-008-0143-y
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发表时间：
2009-01
影响因子：
3
通讯作者：
C. F. Souza;M. V. Folegatti;D. Or
中科院分区：
文献类型：
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作者：
C. F. Souza;M. V. Folegatti;D. Or
通过滴灌增加使用边际优质水，需要合理的施肥做法，使环境问题与可行的作物生产目标相协调。对滴灌形成的湿球区土壤溶液的动态和形态进行了研究。采用时域反射探针（TDR）监测了以2、4和8 L h-1等流速排放的滴管在填土容器中的硝酸钾（KNO3）分布和水分分布。考虑不同剖面的结果，我们观察到滴管附近的溶质储存量较大，向湿润锋方向逐渐减少。在所有实验中，约一半（48%）施用的KNO3溶液储存在第一层（0-0.10 m）， 29%储存在下一层（0.10-0.20 m）。通过比较不同的滴管流量，我们观察到4L/h时溶液储存量更高，在滴管流量为2、4和8L/h时，分别有45%、53%和47%的施用KNO3溶液积聚在第一层（0-0.1 m）。结果表明，基于本实验中使用的体积和频率，以更频繁的间隔施用少量溶液将有利于减少所施水和溶质的深层渗透损失。
The increased use of marginal quality water with drip irrigation requires sound fertigation practices that reconcile environmental concerns with viable crop production objectives. We conducted experiments to characterize dynamics and patterns of soil solution within wet bulb formed by drip irrigation. Time domain reflectometry (TDR) probes were used to monitor the distribution of potassium nitrate (KNO3) and water distribution from drippers discharging at constant flow rates of 2, 4 and 8 L h-1 in soil-filled containers. Considering results from different profiles, we observed greater solute storage near the dripper decreasing gradually towards the wetting front. About half of the applied KNO3 solution (48%) was stored in the first layer (0-0.10 m) for all experiments, 29% was stored in the next layer (0.10-0.20 m). Comparing different dripper flow rates, we observed higher solution storage for 4L/h, with 45, 53 and 47% of applied KNO3 solution accumulating in the first layer (0-0.10m) for dripper flow rates of 2, 4 and 8L/h, respectively. The results suggest that based on the volume and frequency used in this experiment, it would be advantageous to apply small amounts of solution at more frequent intervals to reduce deep percolation losses of applied water and solutes.