Sweet pepper and nitrogen supply in greenhouse production: Critical nitrogen curve, agronomic responses and risk of nitrogen loss

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

doi:10.1016/j.eja.2020.126046

Cited by 26 publications

(10 citation statements)

References 40 publications

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“…The NNI was calculated from the critical N curve derived for greenhouse-grown sweet pepper crop (Critical N = 4.71•DMP −0.22 ; Rodríguez et al, (2020)). The NNI was calculated as: where Nact is the real N measured and Nc is the critical N content calculated from the critical N curve.…”

Section: Dry Matter Production Crop N Uptake Crop N Content Nni and Yieldmentioning

confidence: 99%

Use of fluorescence indices as predictors of crop N status and yield for greenhouse sweet pepper crops

et al. 2021

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To increase nitrogen (N) use efficiency and reduce water pollution from vegetable production, it is necessary to optimize N management. Fluorescence-based optical sensors are devices that can improve N fertilization through non-destructive field monitoring of crop variables. The aim of this work was to compare the performance of five fluorescence indices (SFR-R, SFR-G, FLAV, NBI-R, and NBI-G) to predict crop variables, as dry matter production, crop N content, crop N uptake, Nitrogen Nutrition Index (NNI), absolute and relative yield, in sweet pepper (Capsicum annuum) crops grown in greenhouse. Fluorescence measurements were periodically made with the Multiplex® 3.6 sensor throughout three cropping cycles subjected to five N application treatments. The performance of fluorescence indices to predict crop variables considered calibration and validation analyses. In general, the five fluorescence indices were strongly related with NNI, crop N content and relative yield. The best performing indices to predict crop N content and NNI at the early stages of the crops (i.e., vegetative and flowering phenological stages) were the SFR indices, both under red (SFR-R) and green (SFR-G) excitation. However, in the final stage of the crop (i.e., harvest stage), the best performing indices were NBI, both under red (NBI-R) and green (NBI-G) excitation, and FLAV. The two SFR indices best predicted relative yield of sweet pepper at early growth stages. Overall, the fluorescence sensor and the fluorescence indices evaluated were able to predict crop variables related to N status in sweet pepper. They have the capacity to be incorporated into best N management practices.

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Section: Dry Matter Production Crop N Uptake Crop N Content Nni and Yieldmentioning

confidence: 99%

Use of fluorescence indices as predictors of crop N status and yield for greenhouse sweet pepper crops

et al. 2021

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“…Plants were transplanted as five-week-old seedlings. Additional information of the layout is provided in [38].…”

Section: Experimental Site and Cropsmentioning

confidence: 99%

“…Excessive greenhouse temperature was prevented by applications of CaCO 3 suspension to the greenhouse roof. Details of the timing and applied concentrations of CaCO 3 suspension, and of the resultant transmissivity of photosynthetically active radiation (PAR) are reported in [38]. [18,24,25] was obtained from composite soil samples taken every four weeks, in the 2016 and 2017 crops.…”

Section: Crop Year Date Of Transplantingmentioning

confidence: 99%

“…where N act is the measured N content of all shoot dry matter [31]. N act values for the dates of soil solution and soil sampling were obtained by interpolating from measured crop N content values that were determined in biomass samplings conducted approximately every 21 days, for each N treatment in each crop [38]. N c is the critical N content, for each sampling date, calculated using the critical N curve (CNC): %N c = 4.71 × DMP −0.22 (DMP is dry matter production) for greenhouse-grown sweet pepper determined by [38].…”

Section: Determination Of Crop Nitrogen Nutrition Index (Nni)mentioning

confidence: 99%

“…N act values for the dates of soil solution and soil sampling were obtained by interpolating from measured crop N content values that were determined in biomass samplings conducted approximately every 21 days, for each N treatment in each crop [38]. N c is the critical N content, for each sampling date, calculated using the critical N curve (CNC): %N c = 4.71 × DMP −0.22 (DMP is dry matter production) for greenhouse-grown sweet pepper determined by [38]. The DMP values for each sampling date, that were required to calculate the corresponding %N c values, were interpolated from measured DMP from the regular biomass samplings.…”

Section: Determination Of Crop Nitrogen Nutrition Index (Nni)mentioning

confidence: 99%

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Soil Monitoring Methods to Assess Immediately Available Soil N for Fertigated Sweet Pepper

et al. 2020

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Excessive N application occurs in greenhouse vegetable production. Monitoring methods of immediately available soil N are required. [NO3−] in soil solution, sampled with ceramic cup samplers, and [NO3−] in the 1:2 soil to water (v/v) extract were evaluated. Five increasing [N], from very N deficient (N1) to very N excessive (N5) were applied throughout three fertigated pepper crops by combined fertigation/drip irrigation. The crops were grown in soil in a greenhouse. Soil solution [NO3−] was measured every 1–2 weeks, and extract [NO3−] every 4 weeks. Generally, for treatments N1 and N2, both soil solution and extract [NO3−] were continually close to zero, and increased with applied [N] for treatments N3–5. The relationships of both methods to the nitrogen nutrition index (NNI), an indicator of crop N status, were assessed. Segmented linear analysis gave R2 values of 0.68–0.70 for combined data from entire crops, for both methods. NNI was strongly related to increasing [NO3−] up to 3.1 and 0.9 mmol L−1 in soil solution and extracts, respectively. Thereafter, NNI was constant at 1.04–1.05, with increasing [NO3−]. Suggested sufficiency ranges were derived. Soil solution [NO3−] is effective to monitor immediately available soil N for sweet pepper crops in SE Spain. The extract method is promising.

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Higher Available Soil Water Storage at Sowing and Frequency of Rainfall Events During the First Month Enhanced the Inhibitory Effect of Nitrification Inhibitor on Nitrous Oxide Emissions

Wu,

Li,

Zhang

et al. 2024

J Soil Sci Plant Nutr

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Sweet pepper and nitrogen supply in greenhouse production: Critical nitrogen curve, agronomic responses and risk of nitrogen loss

Cited by 26 publications

References 40 publications

Use of fluorescence indices as predictors of crop N status and yield for greenhouse sweet pepper crops

Use of fluorescence indices as predictors of crop N status and yield for greenhouse sweet pepper crops

Soil Monitoring Methods to Assess Immediately Available Soil N for Fertigated Sweet Pepper

Higher Available Soil Water Storage at Sowing and Frequency of Rainfall Events During the First Month Enhanced the Inhibitory Effect of Nitrification Inhibitor on Nitrous Oxide Emissions

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