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Sugarcane (Saccharum hybrids spp.) is an important sugar crop and cash crop in Guangxi. Revealing the characteristics of sugarcane nutrient requirements is an important foundation for promoting high yield, high quality and efficient cultivation of sugarcane. In recent years, the selection and application of new sugarcane varieties in China have been rapid. A field experiment was conducted in the main sugarcane producing areas of Guangxi on red upland soil to promote the efficient cultivation of new sugarcane varieties. The dry matter accumulation, nutrient accumulation, and nutrient efficiency of GT44, GT49, GT55, GT58 and YT00-236 in both plant and ratoon crops were analyzed. The results showed that the dry matter accumulation in the 2nd ratoon crop of the five varieties was significantly higher than that in the plant and 1st ratoon crops. The accumulated amount of stalk dry matter and whole crop dry matter in three crops were the highest in GT58, reaching 66 946 kg/hm2 and 96 785 kg/hm2, respectively, which was 6.48%-19.01% and 2.57%-25.06% more than that in the other varieties, followed by YT 00-236, and the least in GT 49. The accumulation of N, P and K in the 2nd ratoon crop was significantly higher than that in the plant and 1st ratoon crops for all the varieties. In different crops, the accumulation of N, P and K in the five varieties was 99.81-212.18, 11.04-27.01, 150.09-400.29 kg/hm2, respectively. The accumulated amount of N, P and K in the three crops was the highest in GT58, which increased by 5.16%-20.75%, 4.38%-31.85% and 6.29%-21.45%, respectively, compared with the other varieties, and that in GT49 was the lowest. The N, P, K requirement of a ton cane in different crops for the five varieties was 1.66-2.59, 0.19-0.30 and 2.76-3.76 kg, respectively, but GT44 and GT55 had more requirements while GT49 had less requirements. The economic efficiency of nitrogen, phosphorus and potassium in the three crops was higher in GT49, and the physiological efficiency of nitrogen, phosphorus and potassium was higher in YT00-236. In conclusion, the biological production of GT58 is better, and the nutrient efficiency of GT49 and YT0026 is higher.
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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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