周口地区地处黄淮平原腹地。土壤平坦,土层深厚,光热条件优越,是典型的平原农区,常年玉米种植面积400万亩左右。该区以往所需玉米种子大部分来源于外地,时常出现供种不稳、种价偏高的现象,甚至出现劣种,在很大程度上限制了玉米生产水平的提高。为此,根据立体农业的原理,经多年 Zhoukou area is located in the Huanghuai Plain hinterland. Soil is flat, deep soil, light and heat conditions are typical of the plain areas, perennial corn planting area of ​​400 mu. In the past, most of the corn seeds needed in the area were derived from the field, and instability and high prices were often found in the area. Even the emergence of inferior species greatly restricted the improvement of corn production. To this end, according to the principle of three-dimensional agriculture, after many years