Moisture migration regularity and new irrigation method in the sandy soil of river ancient channel
河流故道区砂质土壤水分运移规律及灌溉制度初探

The moisture migration regularity and the new irrigation method in the sandy soil of river ancient channel were studied.The results indicate that the soil water evaporation capacity in 7 days with different treatments of irrigating water quota is not significantly different.The trial in 7-(year) pear trees soil indicates that the sufficient irrigation and the(reduction) of the frequency of irrigation can save water and raise the yield.The soil(moisture) can not make a breakthrough of the(pear) tree's major root system scope as the (irrigating) water quota is 1200m~3/hm~2 and the soil moisture does not (suffice) the peer when the irrigating water(quota) is 600m~3/hm~2 and the peer trees are irrigated 6 times in the growing(period) of the trees.The irrigating water quota of 900m~3/hm~2 and the 4 times irrigation in the growing period of the trees is the suitable method.