Abstract
We clarified the influence of the weeds on the nitrogen absorption, and translocation and distribution of absorbed nitrogen in corn plant. Results obtained are as follows:
1) Effect of the competition between corn and weeds on the growth of corn were showed much on plant height.
2) Decrease of the total dry matter weight of corn by weeds was indicated in early stage of growth at wide spacing-low manure plots, and after middle stage at another plots. Effect of weeds on the ear weight was the same tendency with total dry matter weight.
3) Competition pattern of corn and weeds under dense spacing-high manure condition was complicate, because intraspecific competition and interspecific competion coexisted in corn field. However, the absorbed nutrient translocated well to the grain, therefore it was showed that corn plants have high recovering ability in condition of dense spacing-high manure.
4) Effect of weed competition on nitrogen content of each organ of corn plant was firstly appeard as decrease in stem, secondly in leaf sheath, and nitrogen content was not decreased in leaf. Its effect on the ear was same in case of the dry matter.
5) Effect of weed competition on nitrogen absosption appeared in middle growing stage under high manure, and it continued from early stage to late stage under low manure.
6) Absorbed nitrogen translocated extremely much into the ear at harvesting stage only in dense spacing-high manure plot.
