| Effects of different water\|retention agents on yield and growth of dryland spring maize |
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| DOI：10.7606/j.issn81000-7601.2020.03.34 |
| Key Words: type of water\|retention agents spring corn physiological index maize yield |
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| Abstract: |
| The application of water retaining agent provides a strong guarantee for the realization of high efficiency production of dry land corn. In order to find out the suitable type of water retaining agent in corn field of dry land in Shanxi Province, the physiological indexes and yield changes of corn in dryland under different types of water retaining agents were studied through a two\|year field positioning test. Four treatments including potassium polyacrylate (PAAS), polyacrylamide (PAM), fulvic acid (HA), and a control (CK) without water retaining agent. The results showed that the application of water retaining agents effectively alleviated the drought stress in the early stage of corn growth in the experimental area, significantly improved the leaf area index, chlorophyll content, photosynthetic rate, transpiration rate, and dry matter accumulation in the above ground of corn at seedling and jointing stages, reduced the rate of corn grain abortion and the bald head length, and increased the ear length, the number of grains per ear and the weight of a single ear.This improved the dryland corn yield. Different types of water retention agents had different effects and they are ranked as PAAS>PAM>HA. Compared with CK, PAAS increased corn yield by 21.6%, ear length by 11.4%, grain number per ear by 120, and single ear weight by 21.6%. Therefore, PAAS could be used as the best choice of water holding agent in local spring corn field to obtain higher corn yield among the studied agents. |
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