从出两片子叶到长四五片真叶为缓慢生长期,此期地上部叶片进行光合作用制造营养物质才能正常生长。主要工作有()。A、灌溉,排水B、追肥C、间苗、补缺D、除草...
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桑树休眠后,用锯或桑剪除去桑树的死拳、枯桩、病虫枝与细小的无效枝,称为整枝修拳。...
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一般方格簇每只簇上放熟蚕()头左右进空率达到(),折簇每平方米上熟蚕()头。...
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防治蜗生对桑园的危害,生物防治方法是保护蜗牛的天敌步行虫、蛙、晰易等。...
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下列哪种繁殖方式不是无性繁殖()A、扦插B、压条C、嫁接D、种子...
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桑子的贮藏一般采用坛罐贮藏。做是:先把用做贮藏的坛罐容器洗净,在坛罐底放生石灰,约占容积的()。...
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栽桑规划的基本原则()A、因地制宜B、合理布局C、综合协调D、防止污染...
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桑树硬枝扦插是利用桑条潜伏的根源体在一定的条件下能发根的原理,通过温、光、水等条件,促其技条生根成苗。...
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春蚕每千克茧用叶(),每盒蚕种用叶()(芽叶),秋蚕每千克茧用叶(),每盒蚕种用叶()(片叶)。...
Friday, January 26, 2024
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()、()、()、()、(),化学消毒,漂白粉消毒=甲醛石灰水消毒,石灰消毒,毒消散消毒,蚕康宁消毒,防消散消毒,优氯净消毒。...
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蚕病微生物((),(),(),()),对于各种病源微生物的抵抗力,蚕龄(),抵抗力()。...
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