Effect of Nitrogen Supply on Growth and Nitrogen Utilization in Hemp (<i>Cannabis sativa</i> L.)
Hemp is a multipurpose crop that is cultivated worldwide for fiber, oil, and cannabinoids. Nitrogen (N) is a key factor for getting a higher production of hemp, but its application is often excessive and results in considerable losses in the soil–plant–water continuum. Therefore, a rational N supply...
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MDPI AG
2021-11-01
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| Series: | Agronomy |
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| Online Access: | https://www.mdpi.com/2073-4395/11/11/2310 |
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| author | Yang Yang Wenxin Zha Kailei Tang Gang Deng Guanghui Du Feihu Liu |
| author_facet | Yang Yang Wenxin Zha Kailei Tang Gang Deng Guanghui Du Feihu Liu |
| author_sort | Yang Yang |
| collection | DOAJ |
| description | Hemp is a multipurpose crop that is cultivated worldwide for fiber, oil, and cannabinoids. Nitrogen (N) is a key factor for getting a higher production of hemp, but its application is often excessive and results in considerable losses in the soil–plant–water continuum. Therefore, a rational N supply is important for increasing N efficiency and crop productivity. The main objective of this paper was to determine the responses of four hemp cultivars to different levels of exogenous-N supply as nutrient solution during the vegetative growing period. The experiment was conducted at Yunnan University in Kunming, China. Yunma 1, Yunma 7, Bamahuoma, and Wanma 1 were used as the experimental materials, and five N supplying levels (1.5, 3.0, 6.0, 12.0, and 24.0 mmol/L NO<sub>3</sub>-N in the nutrient solution) were set by using pot culture and adding nutrient solution. The root, stem, and leaf of the plant were sampled for the determination of growth indexes, dry matter and N accumulation and distribution, and physiological indicators. The plant height, stem diameter, plant dry weight, and plant N accumulation of four hemp cultivars were significantly increased with the increase in exogenous-N supply. Root/shoot dry weight ratios, stem mass density, and N use efficiency decreased significantly with the increase in exogenous-N supply. Nitrogen accumulation, chlorophyll content, soluble protein content, and nitrate reductase activity in leaves were increased with the increase in exogenous-N supply. Among the four indexes, the increase in N accumulation was more than the increase in NR activity. The activities of superoxide dismutase and peroxidase in leaves were increased first and then decreased with the increase in exogenous-N supply, with the maximum value at N 6.0 mmol/L, while the content of malondialdehyde in leaves increased significantly when the level of exogenous-N supply exceeded 6.0 mmol/L. These results revealed that increasing the exogenous-N supply could improve the plant growth, dry matter accumulation, and N accumulation in hemp during the vegetative growth period, but N supply should not exceed 6.0 mmol/L. Among four hemp cultivars, Wanma 1 performed well at 6.0 mmol/L N application. |
| first_indexed | 2024-03-10T05:47:21Z |
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| institution | Directory Open Access Journal |
| issn | 2073-4395 |
| language | English |
| last_indexed | 2024-03-10T05:47:21Z |
| publishDate | 2021-11-01 |
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| spelling | doaj.art-abbd8729f6d049848ff944fde81c1c942023-11-22T22:03:40ZengMDPI AGAgronomy2073-43952021-11-011111231010.3390/agronomy11112310Effect of Nitrogen Supply on Growth and Nitrogen Utilization in Hemp (<i>Cannabis sativa</i> L.)Yang Yang0Wenxin Zha1Kailei Tang2Gang Deng3Guanghui Du4Feihu Liu5Laboratory of Plant Improvement and Utilization, Yunnan University, Kunming 650500, ChinaLaboratory of Plant Improvement and Utilization, Yunnan University, Kunming 650500, ChinaLaboratory of Plant Improvement and Utilization, Yunnan University, Kunming 650500, ChinaLaboratory of Plant Improvement and Utilization, Yunnan University, Kunming 650500, ChinaLaboratory of Plant Improvement and Utilization, Yunnan University, Kunming 650500, ChinaLaboratory of Plant Improvement and Utilization, Yunnan University, Kunming 650500, ChinaHemp is a multipurpose crop that is cultivated worldwide for fiber, oil, and cannabinoids. Nitrogen (N) is a key factor for getting a higher production of hemp, but its application is often excessive and results in considerable losses in the soil–plant–water continuum. Therefore, a rational N supply is important for increasing N efficiency and crop productivity. The main objective of this paper was to determine the responses of four hemp cultivars to different levels of exogenous-N supply as nutrient solution during the vegetative growing period. The experiment was conducted at Yunnan University in Kunming, China. Yunma 1, Yunma 7, Bamahuoma, and Wanma 1 were used as the experimental materials, and five N supplying levels (1.5, 3.0, 6.0, 12.0, and 24.0 mmol/L NO<sub>3</sub>-N in the nutrient solution) were set by using pot culture and adding nutrient solution. The root, stem, and leaf of the plant were sampled for the determination of growth indexes, dry matter and N accumulation and distribution, and physiological indicators. The plant height, stem diameter, plant dry weight, and plant N accumulation of four hemp cultivars were significantly increased with the increase in exogenous-N supply. Root/shoot dry weight ratios, stem mass density, and N use efficiency decreased significantly with the increase in exogenous-N supply. Nitrogen accumulation, chlorophyll content, soluble protein content, and nitrate reductase activity in leaves were increased with the increase in exogenous-N supply. Among the four indexes, the increase in N accumulation was more than the increase in NR activity. The activities of superoxide dismutase and peroxidase in leaves were increased first and then decreased with the increase in exogenous-N supply, with the maximum value at N 6.0 mmol/L, while the content of malondialdehyde in leaves increased significantly when the level of exogenous-N supply exceeded 6.0 mmol/L. These results revealed that increasing the exogenous-N supply could improve the plant growth, dry matter accumulation, and N accumulation in hemp during the vegetative growth period, but N supply should not exceed 6.0 mmol/L. Among four hemp cultivars, Wanma 1 performed well at 6.0 mmol/L N application.https://www.mdpi.com/2073-4395/11/11/2310hemp (<i>Cannabis sativa</i> L.)nitrogen nutritionnitrogen utilization efficiencyvegetative growth |
| spellingShingle | Yang Yang Wenxin Zha Kailei Tang Gang Deng Guanghui Du Feihu Liu Effect of Nitrogen Supply on Growth and Nitrogen Utilization in Hemp (<i>Cannabis sativa</i> L.) Agronomy hemp (<i>Cannabis sativa</i> L.) nitrogen nutrition nitrogen utilization efficiency vegetative growth |
| title | Effect of Nitrogen Supply on Growth and Nitrogen Utilization in Hemp (<i>Cannabis sativa</i> L.) |
| title_full | Effect of Nitrogen Supply on Growth and Nitrogen Utilization in Hemp (<i>Cannabis sativa</i> L.) |
| title_fullStr | Effect of Nitrogen Supply on Growth and Nitrogen Utilization in Hemp (<i>Cannabis sativa</i> L.) |
| title_full_unstemmed | Effect of Nitrogen Supply on Growth and Nitrogen Utilization in Hemp (<i>Cannabis sativa</i> L.) |
| title_short | Effect of Nitrogen Supply on Growth and Nitrogen Utilization in Hemp (<i>Cannabis sativa</i> L.) |
| title_sort | effect of nitrogen supply on growth and nitrogen utilization in hemp i cannabis sativa i l |
| topic | hemp (<i>Cannabis sativa</i> L.) nitrogen nutrition nitrogen utilization efficiency vegetative growth |
| url | https://www.mdpi.com/2073-4395/11/11/2310 |
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