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大田起垄覆膜种植春番茄,较小弓棚双层膜种植,省工省料。但易受晚霜威胁,播期的选择是幼苗管理的关键。 保德县境内,晚霜期一般在5月2日左右(个别特殊年份除外)。播种过早,晚霜未来之前,苗已长高,幼嫩的生长顶端与膜面接触,中午易灼伤,夜晚膜面结冰易受冻。在高温高湿的环境下,容易长成高脚苗。播种过晚,不能及早上市,影响经济效益。正确的选择方法是以晚霜期为基点向前推算。以太原823番茄品种为例,播前
Ridge Ridge planting tomato planting spring, smaller bow shed double film planting, labor-saving materials. But vulnerable to the threat of night frost, sowing the choice of seedling management is the key. Prudential County, the night frost period is generally around May 2 (except for some special years). Sowing too early, the night before the frost, the seedlings have grown taller, the tender growth of the top contact with the membrane surface, easy to burn at noon, the night membrane icing easily cold. High temperature and humidity in the environment, easy to grow tall feet. Sowing too late, can not be listed as soon as possible, affecting economic benefits. The correct choice is based on the night frost period basis forward projections. To Taiyuan 823 tomato varieties, for example, before sowing