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在落叶松的生产育苗中,一般播种时都是作床撒播。播种量6.O—6.5kg。撒播时技术再好,在苗木出土后,也会出现疏密不均,苗床上造成面积大小不等的天窗。对过密的幼苗需要间苗,疏的地方空着,既浪费种子又浪费耕地。在一些科学试验育苗中,如种源试验的采种、杂交育种的制种种子都是来之不易的,因此在育苗试验中采用间苗淘汰的作法就会失掉有价值的种子。为了降低成本,增加收入,除适当减少播种量之外,更为科学的办法就是移栽小苗,试验结果如下。
Larch in the production of nursery, the general sowing are for bed sowing. Sowing 6.O-6.5kg. No matter how good technology when broadcast, after unearthed nursery stock, there will be uneven density, caused by the size of the bed on the sunroof. Seedlings need to be too dense on the seedlings, sparse space, both waste of seeds and waste of land. In some scientific experiment seedlings, such as seed breeding test, hybrid seed breeding seeds are hard-won, so the use of seedling in nursery test out the practice will lose valuable seeds. In order to reduce costs and increase income, in addition to appropriate reduction of seeding, the more scientific approach is transplanting seedlings, the test results are as follows.