設(shè)施園藝ppt課件-展示頁(yè)
2025-05-08 03:46本頁(yè)面
【正文】 ） 對(duì)園藝作物生育的影響對(duì)園藝作物生育的影響? 促進(jìn)種子發(fā)芽出土及加速營(yíng)養(yǎng)生長(zhǎng)。n 降低空氣相對(duì)濕度。p 防止地表鹽分聚集。p 提高土壤肥力及肥料利用率。Date 12二、地膜覆蓋的方式 —— 覆蓋操作Date 13n Plastic is laid using the apparatus shown in this picture. The plastic is laid tighly over a preshaped bed. Drip irrigation tubing on the reel above the plastic is laid under the center of the plastic. The tank at the front of the tractor contains methyl bromide that is injected into the soil as a fumigant before the plastic is laid. the crop can be planted only after the fumigant dissipates. It takes approximately 3 weeks for the methyl bromide to dissipateDate 14 This is properly installed plastic mulch. It is tightly spread across the bed and slightly peaked in the middle to drain rain water. The sides are securely anchored with soil so the plastic will not blow in the wind. Holes are cut, punched, or burned in the plastic to allow planting. Date 15 This punch wheel makes holes in plastic mulch in advance of planting. The wheels can be adjusted to vary the row spacing and distance between plants. Date 16n It is important to create the proper size hole in the plastic. If holes are excessively large, than many of the beneficial effects of the plastic are lost, while if the holes are too small, tender plants may be damaged if they contact the hot plastic. Date 17三、地膜覆蓋的效應(yīng)三、地膜覆蓋的效應(yīng)（一）對(duì)環(huán)境條件的影響p 保持土壤濕度。n 畦高：畦高一定不要超過(guò) 15㎝ （一般適用于內(nèi)蒙地區(qū)）。n 土壤濕度：土不能太干，視墑情澆地，濕土起壟覆膜，以防止水分蒸發(fā)。畦子不平澆水時(shí)容易積水。 Date 11二、地膜覆蓋的方式 —— 技術(shù)要求n 要施足底肥，以有機(jī)肥為主，磷二銨和 K肥要施足，以保證后期苗子不脫肥。 Date 10
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