The Constituting Elements On Yield Of Dry Matter And Crude Protein For Whole Plant And Their Effecting Factors In Silage Corn

With the development of stock raising, silage corn as an important fodder developed rapidly. The aim of maize breeding is to obtain its grain, while silage corn is produced to harvest the whole plant, so a general research on its dry matter, crude protein quantity and crude protein content is necessary. This research concentrates on the flowing aspects: the total products of individual plant; the distribution and diversification of dry matter, crude protein quantity and crude protein content; analysis of the constitution of dry matter, crude protein quantity and crude protein content; analysis of the broad-sense heritability of dry matter, crude protein quantity and crude protein content of the whole plant and different parts; the correlation between dry matter, crude protein quantity, crude protein content and the characters of leaves of the whole plant and different parts; the infection of cultivar practices to yield and quality.The main results of this study include:1. The effects of variety on the fresh yield, dry matter product and grain yield is significant.2. The distribution of dry matter, crude protein quantity and crude protein content in different parts (including stem, ear and leaf) differs: for tillered plant, stem contains more dry matter than ear and leaf for the single-stem varieties, ear contains more dry matter and crude protein content than stem and leaf. For both tillered plant and single-stem varieties, the crude protein content of leaf is higher than that of ear and stem. The dry matter, crude protein quantity and crude protein content of each part (including stem, leaf and ear) of different variety appear to be a normal distribution, while the dry matter, crude protein quantity and crude protein content of the whole plant appear to be abnormal distribution.3. The dry matter and crude protein quantity of single leaf is single-apex curve distribution, and the leaves in the middle part have a higher dry matter and crude protein quantity than leaves in the lower part. The crude protein content of single leaf is a declination linearity distribution. Among different variety, the dry matter, crude protein quantity and crude protein content of leaf in the same part differs.4. The dynamic of dry matter quantity, crude protein content and crude protein quantity of different parts are: 20 to 40 days after spin, the dry matter and crude protein quantity of ear, leaves and the total over-ground part increased, while that of stem didn't increased; The crude protein content of stem and leaves didn't decrease, but that of ear decreased obviously.5. The dynamic of dry matter quantity, crude protein quantity and crude protein content of single leaf are: 20 to 40 days after silking, the single leaf dry matter and crude protein quantity of middle part leaves increased, and that of other leaves keep stability; The crude protein content of all leaves didn't change a lot.6. For single-stem silage corn, the dry matter was affected by the dry matter of ear, the crude protein quantity was affected by the dry matter of ear and leaf, and the crude protein was affected by the crude protein of each part; For tillered silage corn, the dry matter was affected by the dry matter of stem, the crude protein quantity was affected by the dry matter of stem, and the crude protein was affected by the crude protein of each part.7. The correlation between leaf dry matter and stem dry matter is positive, between leaf dry matter and ear dry matter is also positive, while the correlation between stem and ear is negative; the correlation between ear crude protein content and stem crude protein content is positive, and the leaf crude protein content isn't affected by other factors; there is a negative relationship between dry matter and crude protein content.8. The distribution of the broad-sense heritability of dry matter is: stem account for 84.72%, ear account for 32.72%, leaf account for 43.56% and the total plant account for 47.40% .The distribution of the broad-sense heritability of crude protein quantity is: stem account for 73.01 %...