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桑树育苗的苗床形式,大致可分平床、高床、大垅三种。生产实践证明,以高床为最好,平床最差:高床比平床出苗率提高50.2％,保苗率提高25.8％,苗木生长高度增加35％,单产提高20—25％。 平床虽有蒸发面小、蓄水足、不易返盐、简单省工等优点,但幼苗期间要实行漫灌,死苗严重,盐碱较重地更甚。大垅在幼苗期间可实行沟灌,但蒸发面大,蓄水少,容易返盐,且做垅技术复杂,不易掌握,费工多。高床综合了上述两种苗床的优点,克服了它们的缺点,较为理想。
Mulberry nursery seedbed form, can be roughly divided into flat bed, high bed, big bream three. Production practice has proved that high bed is the best, the worst flat bed: high bed than the flat bed seedling increased by 50.2%, seedling raising rate increased by 25.8%, 35% increase seedling height, yield increased by 20-25%. Although the flat bed evaporation surface is small, water enough, not easy to return to salt, simple and labor-saving advantages, but during the implementation of flood irrigation seedlings, dead seedlings severe, saline even heavier. Daping can be implemented during seedling ditch, but the evaporation surface, less water, easy to return salt, and do 垅 technical complexity, difficult to grasp, more work. High-bed combines the advantages of the two seed beds to overcome their shortcomings, the more ideal.