众所周知,各种农作物的播种量都是在农业科研单位和一些先进国营农场试验的基础上确定的。当前,应当以一公顷或一米行长所规定的种子数精密地播种各种农作物。为此,需要精心地准备种子和播种机,以便按照指定的播种量要求定准种子量、调整好播种机。同时,还应当考虑到同一种作物的播种量可能由于各生产单位的具体条件(诸如地区分布、气候、耕地状况、品种、种子的粒级及其发芽率以及其他条件)的不同而发生变化。因 It is well known that the seeding rates of various crops are determined on the basis of experiments conducted by agricultural research institutes and some advanced state-owned farms. At present, all kinds of crops should be precisely sown with the number of seeds stipulated by one hectare or one meter of governor. In order to do this, it is necessary to carefully prepare the seed and planter so that the planter can be adjusted according to the specified seeding amount and the seed amount can be adjusted. At the same time, it should also be taken into account that the seeding rate of the same crop may vary depending on the specific conditions of each production unit, such as regional distribution, climate, status of arable land, variety, seed grain size and germination rate, and other conditions. because