Corn ear more reasons
According to the biological characteristics of corn growth and development, in addition to the upper stem section 5, every festival stems axillary bud (latent bud), each axillary bud has the potential to form clusters.But corn has ear position advantage, namely the axillary bud section 6 ~ 8 corn ear conditions in one of the best ears will be priority development, and produces hormones in the process of its growth and development, promote the plant nutrients to its transport, inhibit other young ear differentiation and development, make its become dormant buds.If the first development of the young ear of corn is influenced by external causes and arrested development, can not form enough hormone suppression other axillary bud spike differentiation and development, its ear advantage will be lost, may appear more young ear corn stover, thus forming the phenomenon of more than one ear.Actually, ear of corn belongs to abnormal CeJing on botany, ear handle for shortening the stem, the nodes with 1 piece of bract (only twisted leaf petioles), lurking in the bract axil a certain number of axillary bud, when the main shaft by adverse factors death and nutrient accumulation of more cases, can cause the axillary bud stirring, develop into multiple small ear, form the "fingers" spike.Therefore, in addition to the varieties of own characteristic in theory, more ear phenomenon is the root cause of the loss of ear advantage.In actual production, we found that lead to local factors of fresh corn ear phenomenon occurs mainly has the following three aspects.
1, the varieties of factors
Different varieties of axillary bud development process is different, have different degree of spike occurred more also, this is decided by the genetic characteristics of corn varieties itself.Some varieties under the condition of appropriate multiple synchronization axillary bud differentiation development form ear, more other varieties first axillary bud differentiation development of obvious advantages, thus inhibiting the next section clusters development process, is not easy to form more ear.
2, climate adverse factors
1) high temperature In spring fresh corn powder tasseling stage, tends to a continuous hot wind, not only the temperature is high, and the air humidity is very low, when the temperature above 35 ℃, the male ear powder will shorten the time and also easy to wither rapid filtration death, filaments in the pollen grain, make 1 female spike fertilization rate is low, ear position advantage is restrained, in the later fertilizer condition good cases, the following axillary latent axillary bud develops rapidly, and form more fringe phenomenon, but the basic not little seed or seed.This kind of phenomenon in the growth period of late varieties are more likely to happen.
(2) drought In the critical period of water requirement of corn that big trumpet period to tasseling stage in dry lack water, not only affects the ear grains/ear and tassel pollen counts, tassel cannot pulls out powder, the formation of "their" drought, and because the ear higher request of moisture, high temperature and drought makes the ear development relative lag, not produce silk in time, form a "male and female flowering don't meet", the first female spike in normal fertilization and development cannot lose ear position advantage, resulted in more than one individual plant occurs.If in 1 female spike differentiation middle face severe dry weather, can make 1 female spike spindle no longer development, induce its latent bud initiation, form the "fingers" spike, but this tassel often ends in bulk powder period or have powder, forming a knot and no grain more than a few spikelets.
(3) sounds the weather Met much light at anthesis, tasseling sounds weather, humidity, tassel pollen adhesion in groups, not easy to loose powder, and even loose powder, and also for the ear filaments rain killed ruptured pollen grains swell and affects the fertilization, weaken its ear position advantage, excess nutrition was assigned to the below sections axillary bud spike, which leads to more ear.
3, cultivation management factors
(1) improper sowing Early spring fresh corn planting too early or too late to make corn in male and female spike differentiation or pulls hair sounds at low temperature or high temperature and drought, the bad weather, or make fresh corn sensitive period with the first generation of rice planthopper journey adult height, lead to serious disease occurs, a female spike differentiation anomaly.
(2) the density is too large Planting density is too large, corn leaf to cover each other, pollen is not easy to land on the ear, a can normal fertilization, together with other conditions is appropriate, will be prompted by a female spike development, also can form more than guangzhou.According to the survey, the density, the greater the more ear plant, the more the more serious the lack of grain.
(3) and water too much In the ear of corn after jointing stage and development stage, if the water is too large, carbon and nitrogen metabolism is not harmonious, affect the sugars and other nutrients to grain transport and accumulation of excessive nutrients could prompt more female head developed more.Seedling stage exhibited great waters, especially nitrogen fertilizer were too much, also prone to ear more phenomenon.
(4) the serious harm of diseases and pests Corn plant disease virus infection after kinetin hormones such as break within the original plant hormone balance, lead to the withdrawal of the ear ear advantage 1, forming a lot of spikelet.Disease the earlier onset of field, plant suffer more severe, the more dwarf plant and spike strains.Local in 5 ~ 6 months tasseling corn aphids harm often heavier, if not timely prevention and cure, serious can make the tassel pollen less or no pollen, affecting the normal development of corn ear, causing fringe phenomenon.
More than corn ear
1, choose good varieties of science
The choice of fresh corn varieties should be scientific and objective, adjust measures to local conditions, can not blindly pursue novel, peculiar, in addition to choose suitable for the local climate environment and a variety of market consumption habits, should also pay attention to choose wide adaptability and resistance of early and medium ripening varieties, high quality to avoid more corn ear.If used in the production of certain itself has many characteristics of rice, should be in spinning stage of early artificial remove invalid ear, can improve the yield and the forage-livestock system.
