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在沙土地上种植马铃薯,只有配合适当的灌溉才可能高产质佳。了解最低需水量和掌握作物对水的胁迫作用的反应是很重要的。本项研究于1979年和1980年两个年度进行,目的是确定灌溉率对马铃薯表现的影响。处理在沙土地于冠层郁闭时开始实施,利用线性灌溉技术。接近喷灌源的日喷灌量是1.15E_t。处理实施两周后,开始在喷灌量最少的小区中观察植株对水的胁迫反应的症状。这些症状和正常植株比包括:植株变小,叶片变少,死叶增多和比叶重增大。块茎和地上部生长率随灌溉量增大而增大,从最小灌溉量到最大灌溉量分别为2.62～17.63克/米~2/天和-0.90～10.01克/米~2/天。同化产物向块茎的输送随灌溉量的增大而变小。试验结果表明,在沙土地上种植马铃薯,如果要避免产量下降和品质变劣,灌水量要接近估算的E_t。灌水量超过100％E_t不能增加产量。
Planting potatoes on sandy soil is only possible with good yields with proper irrigation. It is important to understand the minimum water requirement and to master the crop’s response to water stress. The study was conducted in 1979 and 1980 respectively in order to determine the effect of irrigation rates on potato performance. Treatment begins when sandy canopy is closed at the canopy, using linear irrigation techniques. Close to the sprinkler irrigation day irrigation is 1.15E_t. Two weeks after the treatment, the symptom of the plant’s water stress response began to be observed in the area with the least amount of sprinkling. These symptoms and normal plant ratio include: smaller plants, fewer leaves, dead leaves increased and specific leaf weight increased. The growth rate of tubers and aboveground parts increased with the increase of irrigation amount from 2.62 to 17.63g / m ~ 2 / day and -0.90 ~ 10.01g / m ~ 2 / day from the minimum irrigation amount to the maximum irrigation amount respectively. Assimilation products to the tuber transport with the amount of irrigation smaller. The test results show that planting potatoes on sandy soil is close to the estimated E_t if it is to avoid yield decline and deterioration. E_t can not increase the yield when irrigation volume is over 100%.