一、试区基本情况试验区设于灵武农场的三站29号地的南半部第7、8两条,计80多亩,实际种植面积为66亩,地势西南高而东北低,坡降约千分之一左右,29号地于1953年规划开荒,因盐分大未进行耕作利用,土壤为黄河冲积和山洪淤积而成,属砂质土,在0—100厘米内夹有一至二层粘 I. Basic conditions of the trial area The trial area is located in No.7 and No.8 of the southern half of No.39 Station of Lingwu Farm and covers an area of ​​80 mu with an actual planting area of ​​66 mu. The terrain is high in southwest and low in northeast. Reduction of about one thousandth, No. 29 land reclamation planning in 1953, due to the salt is not yet used for farming, the soil for the Yellow River alluvial and silting sediments is a sandy soil, in the 0-100 cm sandwich one or two Layer sticky