玉米收获早晚,对产量和质量影响很大。有些玉米产区习惯在玉米果穗苞叶发白、籽粒上部变硬时收获。研究表明,这时的玉米仅处在蜡熟期,还没有完全成熟。尤其紧凑型玉米,有早白皮、晚成熟的“假熟”现象,此时收获,玉米要减产10％左右,且品质差,出粉率低。 玉米成熟的主要标志是籽粒乳线消失。籽粒乳线是在玉米开花授粉后28—30天出现的。随着灌浆强度的增加,淀粉首先在籽粒顶部充实、沉积,开始形成固体,但籽粒中、下部仍为乳浆状液体,这 Corn harvest sooner or later, a great impact on yield and quality. Some corn producing areas are used to corn white ear ears, harvested when the hardened upper part of the grain. Studies show that the maize at this time only in the waxy period, not fully mature. In particular, compact corn, with early white, late mature “fake cooked” phenomenon, this time harvest, maize to cut about 10%, and poor quality, low rate of flour. The main mark of maize maturity is the disappearance of the grain milk line. The kernel of the grain appears 28-30 days after flowering and pollination of the corn. With the increase of grouting strength, starch first enriched in the top of the grain, deposited and began to form a solid, but in the grain, the lower part was still a milk-like liquid, which