Effect of Water and Nitrogen Interaction on the Growth, Photosynthetic Characteristics, and Yield of Industrial Hemp
Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2021, Vol. 42 ›› Issue (8): 2324-2333.DOI: 10.3969/j.issn.1000-2561.2021.08.027

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

Effect of Water and Nitrogen Interaction on the Growth, Photosynthetic Characteristics, and Yield of Industrial Hemp

GAO Jinhu1, Li Chong2, ZHAO Mingsen1, FEN Xuping1, KONG Jiaqiang1, XUE Hongli1, MENG Xiaokang1, KANG Hongmei1,*()   

  1. 1. Institute of Industrial Crops, Shanxi Agricultural University, Taiyuan, Shanxi 030031, China
    2. Fenyang Meteorological Bureau, Fenyang, Shanxi 032200, China
  • Received:2020-07-16 Revised:2020-09-08 Online:2021-08-25 Published:2021-09-09
  • Contact: KANG Hongmei

Abstract: Aim

ed at the problem of unreasonable irrigation and nitrogen application in the seed-use industrial hemp planting area, different levels of irrigation and nitrogen application were set under field conditions to discuss crop growth, SPAD value (chlorophyll content), leaf photosynthetic performance, yield and its constituent factors. The changes reveal the response mechanism of hemp seed yield to the interaction of water and nitrogen and provide a theoretical basis for determining the appropriate amount of water and nitrogen application. A two-factor four-level randomized block trial design was adopted. The four irrigation levels were set to 0 (W0), 60 (W1), 120 (W2), 180 (W3) mm, and the four nitrogen application rates were set to 0 (N0), 225 (N1), 450(N2), 675(N3) kg/hm2. Both irrigation (W1, W2, W3) and nitrogen application (N1, N2, N3) could significantly increase the plant height, stem diameter, and above-ground dry matter mass values of industrial hemp. The SPAD value was N0 < N1 < N2 <N3, and W0 < W1 < W2 < W3 under different irrigation and nitrogen fertilizer treatments, respectively. Both irrigation and nitrogen application significantly improved the photosynthetic performance of industrial hemp leaves to a certain extent. The hemp seed yield of W3 and W2 was significantly higher than that of W0. The hemp seed yield of N3 and N2 was significantly higher than that of N0. W2N2 had the highest yield, 11.25% and 22.01% higher than W2N0 and W0N0, respectively. Path analysis showed that different water and nitrogen treatments resulted in changes in branch height, stem diameter, and the number of branches, which affected the yield. Irrigation of 60 mm in the rapid growth and flowering periods, combined with 450 kg/hm2 fertilization before sowing, is the best water and nitrogen supply mode for seed industrial hemp, which can save costs and increase production.

Key words: industrial hemp, irrigation, nitrogen application rate, photosynthetic performance, seed yield

CLC Number: