Foreword.The pineapple is an important crop. Can be grown, general every region of the country, the pineapple plantation of farmers in the eastern and western regions. Will be planted to send canning factory But in the northeast. Is used to eating fresh fruit, northeast, characteristics of soil sand to clay sand. Most of the land is low natural abundance (land), the agricultural 2550 soil contact for a long time. Using large tractors and tools Often makes the earth"s soil under dense Dan I plow (hard pan), which is called plow pan subsoil soil แห้งจะ solid plant roots can"t stab pass. (composed of honor, 2551) and moisture from the soil can not move up to the top soil. The availability of water in the soil and plant nutrients in soil decreased birth and faculty (2547) indicates that the system tillage and tillage rarely make the physical properties of soil. The soil moisture content is high. The seepage of water and porosity of soil increased. Soil bulk density decreased by only when the soil depth is more and more. Compared with traditional tillage planting.
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