Effects of Reduced Fertilization on Main Agronomic Traits, Yield and Fertilizer Utilization Rate of Sugarcane under Mulched Drip Fertigation System
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Chinese Journal of Tropical Crops ›› 2023, Vol. 44 ›› Issue (11): 2322-2329.DOI: 10.3969/j.issn.1000-2561.2023.11.021

• Plant Cultivation, Physiology & Biochemistry • Previous Articles     Next Articles

Effects of Reduced Fertilization on Main Agronomic Traits, Yield and Fertilizer Utilization Rate of Sugarcane under Mulched Drip Fertigation System

PENG Lishun1,2,3, CAO Zhengying1,2,3, CAI Wenwei1,2,3, GAN Yimei1,2,3, YANG Benpeng1,2,3,*()   

  1. 1. Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
    2. Hainan Institute of Tropical Agricultural Resources, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
    3. Sanya Research Institute, Chinese Academy of Tropical Agricultural Sciences, Sanya, Hainan, 572024, China.
  • Received:2022-09-27 Revised:2022-10-28 Online:2023-11-25 Published:2023-12-08
  • Contact: *YANG Benpeng,E-mail:y-bp@163.com

Abstract:

The present study revealed the effects of chemical fertilizer reduction patterns on growth, cane yield and fertilizer utilization rate of sugarcane, in order to provide a theoretical basis for the application of mulched drip fertigation and find out the best pattern to reduce fertilizer in sugarcane. Seven different treatments were conducted: no fertilization (CK0), conventional fertilization (CK1), mulched drip irrigation + conventional fertilization (CK2), mulched drip fertigation T100 (fertilizer amount equated with CK1) and T80, T70, T60 (20%, 30% and 40% reduction of fertilizer amount of T100). Main agronomic characters, cane yield, sucrose content, sugar yield, economic benefit and nutrient utilization rate of sugarcane were measured in the seven different treatments. The results showed that compared with CK1, the millable stalk number in CK2 increased significantly, the tillering rate, plant height, millable stalk number and stalk formation rate in T100 were all improved significantly, the effective stalk number and stalk formation rate in T80 and T70 were improved significantly. Compared with CK1, the cane yield in CK2, T100, T80 and T70 increased significantly by 13.64%, 32.20%, 27.00% and 20.18%, respectively. In the different drip fertigation treatments, there was no significant differences for cane yield between T100 and T80, but the cane yield for T70 and T60 decreased significantly in contrast to T100. There was no significant difference in sugar content among the different drip fertigation treatments. The change trend of sugar yield and cane yield among the treatments was consistent. Sugar yield in T100 and T80 was higher than that in other treatments, and there was no significant difference between that in T100 and T80. Compared with CK1, the net benefit in T100 and T80 increased significantly by 4534.4 yuan/hm2 and 3953.8 yuan/hm2, respectively. The net benefit in T70 and T60 decreased significantly compared with T100, and the net benefit in T60 was even 2350 yuan/hm2 lower than that in CK1. The fertilizer utilization rate of all drip fertigation treatments was significantly higher than that of CK1, and the average utilization rates of nitrogen, phosphorus and potassium fertilizers in T80 were the highest in all the treatments, reached 48.36%, 27.70% and 68.95%, respectively, which was 28.42, 17.95 and 30.71 percentage points higher than that of CK1, respectively. Overall, in the middle fertility of laterite soil, the application of mulched drip fertigation pattern for T80 could obtain ideal cane yield and benefit.

Key words: sugarcane, mulched drip fertigation, reduction fertilization, yield, fertilizer use efficiency

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