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To understand the effects of different fertilization rates and planting densities on yield and economic benefit of Zhuangtang 6, and to determine the optimal fertilization level and planting density, field experiments were carried out in Longʼan cane area of Nanning and Jiangzhou cane area of Chongzuo. A two-factor split-block design was conducted, with the main treatment (A) of fertilization. Three levels of 42% compound fertilizer 3750 (high fertilizer, A1), 2250 (medium fertilizer, A2) and 1125 kg/ha (low fertilizer, A3) were set. For secondary treatment (B), five planting densities were set: low density B1 (60 000 buds/ha), medium- low density B2 (75 000 buds/ha), medium density B3 (90 000 buds/ha), medium-high density B4 (105 000 buds/ha), and high density B5 (120 000 buds/ha). The results showed that the yield of Zhuangtang 6 sugarcane increased with the increasing planting density; however, there was no significant difference between yield and fertilization level. The correlation analysis showed that the yield and tillering rate were negatively correlated in the two cane areas (significantly in Longʼan and extremely significantly in Jiangzhou), and yield was significantly positively correlated with the number of productive stalks. The economic benefit of A3B5 treatment was the highest. The yield of A3B5 treatment in Longʼan area of Nanning was 91.44 t/ha, with an economic benefit of 35 419.5 yuan/ha, which was 6.75% higher than that of A2B4 treatment with the highest yield of 92.32 t/ha. The yield of A3B5 treatment in Jiangzhou area of Chongzuo was 74.88 t/ha, with an economic benefit of 27 190.2 yuan/ha, which was 27.15% higher than that of A1B4 treatment with the highest yield of 77.40 t/ha. Considering the different water and fertilizer conditions and management levels of the two sugarcane areas, the suitable fertilizer application rate for high-yield and high efficiency planting of Zhuangtang 6 is 1125-2250 kg/ha, and the reasonable planting density is 10 500-12 000 buds/ha.
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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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