每一类作物都有它的最佳收获期,虽然品种、类型不同,但都有其共同的标志。小麦是在蜡熟期,此时子粒含水量急剧下降到25％,胚乳成蜡质状,子粒可用指甲切断,挤出蜡状胚乳,但挤不出水来;子粒表面变为黄色,叶片干黄,茎杆节间呈金黄色,穗子变黄,只有茎节和穗节尚微带绿色。此时千粒重最大,是收获最佳的时候。玉米是在完熟期,此时茎杆变黄,叶子枯萎,苞叶黄 Each type of crop has its best harvest period, although the variety and type are different, but they all have their common mark. Wheat is in the ripening period, at which point the water content of the seeds drops sharply to 25%, the endosperm becomes waxy and the seeds can be cut off with nails and the waxy endosperm is extruded, but the water does not squeeze out; the surface of the grains becomes yellow, , Stem internodes were golden yellow, ears yellow, only the stem nodes and spike Festival is still microstrip green. At this point 1000 grain weight is the best time to harvest. Corn is in maturity, when the stem turns yellow, leaves withered, husk yellow