Crops ›› 2024, Vol. 40 ›› Issue (3): 216-222.doi: 10.16035/j.issn.1001-7283.2024.03.029

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Effects of Different Proportions of Nitrogen, Phosphorus and Potassium on Photosynthetic Characteristics, Yield and Quality of Pueraria lobata var. thomsonii

Ou Kunpeng1(), Wang Xueli2, Wang Yan1(), He Minghui2, Huang Liankang2, Zheng Debo1, Lin Qian1   

  1. 1Biotechnology Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007,Guangxi, China
    2Agriculture College, Guangxi University, Nanning 530004, Guangxi, China
  • Received:2023-02-02 Revised:2023-11-23 Online:2024-06-15 Published:2024-06-18

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Abstract:

The effects of different proportions of nitrogen (N), phosphorus (P) and potassium (K) on photosynthetic characteristics at different growth stages of Pueraria lobata var. thomsonii was investigated to provide a theoretical basis in scientific fertilization management. In order to investigate the response characteristics of P.lobata var. thomsonii in the seedling stage, root tuber formation stage, root tuber expansion stage, and starch accumulation stage under varying nitrogen, phosphorus, and potassium fertilizer proportions, as well as the effects of different fertilization levels on the yield, starch, and puerarin contents of P.lobata var. thomsonii, the “3414” randomized block design was employed. The results showed that the root tuber formation stage was a more sensitive stage to regulate the photosynthesis efficiency of fertilizer application. The yield of P.lobata var. thomsonii was significantly raised by the medium amount nitrogen, phosphorus, and potassium fertilization treatment (N2P2K2) and the low amount nitrogen fertilization treatment (N1P2K2). The content of starch (40%) in low amount nitrogen fertilization treatment (N1P2K2) were the highest, puerarin content of P.lobata var. thomsonii were significantly increased in low amount potassium (N2P2K1) and high fertilization treatment (N2P2K3). In summary, the N1P2K2 combined application scheme could focus more on the yield and quality of P.lobata var. thomsonii. It also enhanced the photosynthetic efficiency of leaves and promoted an increase in P.lobata var. thomsonii yield. Additionally, the combined application of low amount nitrogen fertilization treatment (N1P2K2) increased the starch and puerarin contents of root tubers.

Key words: Pueraria lobata var. thomsonii, Potosynthetic characteristics, Yield, Quality

Fig.1

SPAD value of P.lobata var. thomsonii at different growth stages under different treatments Different letters represent significant differences (P < 0.05), the same below."

Fig.2

Pn of P.lobata var. thomsonii at different growth stages under different treatments"

Fig.3

Gs of P.lobata var. thomsonii at different growth stages under different treatments"

Fig.4

Ci of P.lobata var. thomsonii at different growth stages under different treatments"

Fig.5

Tr of P.lobata var. thomsonii at different growth stages under different treatments"

Table 1

Changes of fresh weight per plant and yield of P.lobata var. thomsonii"

处理
Treatment		 单株鲜重
Fresh weight per plant (kg)		 产量
Yield (kg/hm2)
N0P0K0 1.76±0.02e 20 937.36±275.33e
N0P2K2 1.80±0.08e 21 303.30±890.77e
N1P2K2 3.07±0.06ab 36 435.16±685.21ab
N2P0K2 1.92±0.15e 22 757.14±1798.67e
N2P1K2 2.92±0.02ab 34 605.49±198.54ab
N2P2K2 3.31±0.34a 39 224.18±4086.04a
N2P3K2 2.91±0.06ab 34 506.59±770.86ab
N2P2K0 2.11±0.05de 24 982.42±548.17de
N2P2K1 3.12±0.09ab 37 028.57±1062.07ab
N2P2K3 2.41±0.02cd 28 651.65±243.67cd
N3P2K2 2.18±0.14de 25 832.97±1719.97de
N1P1K2 2.96±0.15ab 35 129.67±1781.54ab
N1P2K1 2.78±0.05bc 32 993.41±650.95bc
N2P1K1 2.03±0.17de 24 092.31±1995.06de

Fig.6

Starch and puerarin contents of P.lobata var. thomsonii under different treatments"

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