Root and crop responses of sweet pepper (Capsicum annuum) to increasing N fertilization

Grasso, Rafael; Souza, Romina de; Peña-Fleitas, M. Teresa; Gallardo, M.; Thompson, R.B.; Padilla, Francisco M.

doi:10.1016/j.scienta.2020.109645

Cited by 6 publications

(2 citation statements)

References 47 publications

(68 reference statements)

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“…In the present study, the root/shoot dry weight ratio in hemp decreased significantly with the increase in exogenous-N supply, suggesting that excessive N application maximized the shoot development and minimized the root growth. These results are consistent with the previous studies on sweet pepper and maize crops [25,28]. Thus, we observed that the weak plant stem and underdeveloped root were caused by excessive N application, which is prone to lodging and affects the yield in hemp.…”

Section: Discussionsupporting

confidence: 93%

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Effect of Nitrogen Supply on Growth and Nitrogen Utilization in Hemp (Cannabis sativa L.)

et al. 2021

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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 NO3-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.

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Section: Discussionsupporting

confidence: 93%

“…In response to N deficiency in crops, assimilates are preferentially used for root development rather than shoot development [25]. Meanwhile, under a higher supply of N, the development of the aerial parts increased and the development of the roots decreased [26,27].…”

Section: Discussionmentioning

confidence: 99%