苗圃除草和松土的费用,在育苗的总开支中总是占去很大一部份。根据土壤条件、杂草生长情况、全年气候及小区除草方法等条件的不同,这一费用占全年工资总支出的25%到50%。机械除草的费用比较高(1963年每公亩约为70马克),而化学除草在节约劳力和工资费用等方面有着明显的优越性,1963年每公亩为20马克 Nursery weeding and loosening costs always account for a large part of the total cost of raising seedlings. Depending on conditions such as soil conditions, weed growth, year-round climate and community weeding practices, this cost represents between 25% and 50% of the total annual wage bill. The cost of mechanical weeding is relatively high (about 70 marks per acre in 1963), and chemical weeding has obvious advantages in terms of labor saving and wage costs. In 1963, it was 20 marks per acre