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To investigate the effects of potassium polyacrylate (K-PAM) application rates on the grain filling characteristics and yield formation of black hulless barley, a randomized block design was employed using the black hulless barley variety Liuling as the test material. Five K-PAM application rates (0, 6, 12, 18, and 24 kg·hm-2, labeled as CK, T1, T2, T3, and T4, respectively) were carryed out for field experimenk. The results indicated that, compared with CK, application of K-PAM significantly increased the 1 000-grain weight of black hulless barley, with the increase rate of 0.92%, 10.64%, 5.27%, and 8.03% for T1, T2, T3, and T4 treatments, respectively. Under the T2 treatment, the maximum grain filling rate (Rmax) of black hulless barley was significantly higher than that of CK, with an increase rate of 7.56%, grain yield was increased by 17.61%, the number of effective panicles was increased by 20.92%, and grains per panicle was increased by 22.42%. Thus, the application of K-PAM may help black Highland barley seeds to fill, promote the synergistic enhancement of panicle number, panicle grains number and grain weight, and increase grain yield. Under the conditions of this experiment, the optimal application rate of K-PAM is 12 kg·hm-2.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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