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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Autores principales:	Yang Yang, Wenxin Zha, Kailei Tang, Gang Deng, Guanghui Du, Feihu Liu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	hemp (<i>Cannabis sativa</i> L.) nitrogen nutrition nitrogen utilization efficiency vegetative growth Agriculture S
Acceso en línea:	https://doaj.org/article/abbd8729f6d049848ff944fde81c1c94
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spelling	oai:doaj.org-article:abbd8729f6d049848ff944fde81c1c942021-11-25T16:11:11ZEffect of Nitrogen Supply on Growth and Nitrogen Utilization in Hemp (<i>Cannabis sativa</i> L.)10.3390/agronomy111123102073-4395https://doaj.org/article/abbd8729f6d049848ff944fde81c1c942021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4395/11/11/2310https://doaj.org/toc/2073-4395Hemp 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.Yang YangWenxin ZhaKailei TangGang DengGuanghui DuFeihu LiuMDPI AGarticlehemp (<i>Cannabis sativa</i> L.)nitrogen nutritionnitrogen utilization efficiencyvegetative growthAgricultureSENAgronomy, Vol 11, Iss 2310, p 2310 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	hemp (<i>Cannabis sativa</i> L.) nitrogen nutrition nitrogen utilization efficiency vegetative growth Agriculture S
spellingShingle	hemp (<i>Cannabis sativa</i> L.) nitrogen nutrition nitrogen utilization efficiency vegetative growth Agriculture S 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.)
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.
format	article
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
title	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_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_sort	effect of nitrogen supply on growth and nitrogen utilization in hemp (<i>cannabis sativa</i> l.)
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/abbd8729f6d049848ff944fde81c1c94
work_keys_str_mv	AT yangyang effectofnitrogensupplyongrowthandnitrogenutilizationinhempicannabissativail AT wenxinzha effectofnitrogensupplyongrowthandnitrogenutilizationinhempicannabissativail AT kaileitang effectofnitrogensupplyongrowthandnitrogenutilizationinhempicannabissativail AT gangdeng effectofnitrogensupplyongrowthandnitrogenutilizationinhempicannabissativail AT guanghuidu effectofnitrogensupplyongrowthandnitrogenutilizationinhempicannabissativail AT feihuliu effectofnitrogensupplyongrowthandnitrogenutilizationinhempicannabissativail
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Effect of Nitrogen Supply on Growth and Nitrogen Utilization in Hemp (<i>Cannabis sativa</i> L.)

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