Nitrogen sufficiency index for estimating nitrogen fertilizer requirement of irrigated rice

Santos, A. B. dos; Silva, Mellissa Ananias Soler da; Silveira, Pedro Marques da; Carvalho, Glaucilene Duarte; Stone, L. F.

doi:10.1590/0034-737x201966060003

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…For the cultivar BRS FC104 sown in a 45-cm spacing, Gonzaga (2017) found a linear increase in yield up to the largest population of the experiment, 20 plants per meter. An economic criterion for the recommendation of input dose is maximum technical efficiency, that is, 90-95% of the maximum yield (Santos et al, 2019). Thus, considering seed economy, it is possible to recommend a population of 11.6 plants per meter, corresponding to 95% of the maximum yield, 2998 kg ha -1 .…”

Section: Resultsmentioning

confidence: 99%

Management of plant architecture, spacing and population on the yield of super early common bean

2020

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For efficiency in the use of production factors and maximization of the yield of cultivars, it is essential to determine the most appropriate spatial arrangement for each cultivar and environment. This study identifies the effects of artificial adjustment of plant architecture, spacing between rows, and plant population on the yield of the super early common bean cultivar BRS FC104. We conducted the experiment in randomized blocks with subdivided plots and three replicates. In the plots, we assessed the spacing between rows (22.5, 45.0, and 67.5 cm). In the subplots, we considered the levels of artificial adjustment of plant architecture (maintenance of one or three lateral branches and control without architecture adjustment). In the subsubplots, we assessed populations of 6, 11, 16, and 21 plants per meter. The number of pods per plant increased with the increase in spacing between rows and with the reduction in plant population. Grain weight, in turn, increased with the reduction in spacing between rows and with the increase in plant population up to 14.7 plants per meter. Regarding grain yield and seed economy, the most suitable spatial arrangement for the super early cultivar consists of a 22.5 cm spacing between rows with about 12 plants per meter. The change in plant architecture, with the removal of lateral branches, is not effective to maximize yield.

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Section: Resultsmentioning

confidence: 99%

Management of plant architecture, spacing and population on the yield of super early common bean

2020

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Emission of nitrous oxide in flooded rice cultivation in tropical area of Brazil

Mascarenhas

Silva

Correchel

et al. 2020

Pesq. agropec. bras.

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The objective of this work was to evaluate the effects of nitrogen fertilizers on the N dynamics and grain yield in flooded rice (Oryza sativa) cultivation in Brazilian tropical wetland. The experiment was carried out in a randomized complete block design with six treatments, as follows: common and protected urea; topdressing application of N doses (30, 70, and 150 kg ha-1); and one control treatment, without N fertilization. Emissions of N2O-N, global warming potential (pGWP), emission factors (EF) for mineral fertilizers, grain yield, emission intensity, nitrate, ammonium, pH, and potential redox were quantified. Gas sampling was carried out in two crop seasons of rice cultivation and in one off-season. During the flooded period of the two crop seasons, N2O fluxes did not exceed 862.41 μg m-2 h-1 N2O-N; in the off-season, the fluxes varied from -52.95 to 274.34 μg m-2 h-1 N2O-N. Consistent emission peaks were observed in soil draining before harvest, when the highest rate of both N sources was used, and also in the control treatment in the off-season. Protected urea does not reduce N2O emissions or EF. Nitrogen increases the grain yield. Protected urea does not have any effect on the pGWP. The concentrations of NO3- and NH4+ in the soil are not related to N2O fluxes.

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Orta Anadolu Kuru Şartlarında Ekmeklik Buğdayda Optik Sensöre Dayalı Mevsim İçi Azotlu Gübre Kalibrasyon Optimizasyonu

Savaşlı

Önder

Cekic

et al. 2021

Kahramanmaraş Sütçü İmam Üniversitesi Tarım Ve Doğa Dergisi

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This study aimed to determine the Wheat response to nitrogen topdressing doses and calibrate the optic sensör NDVI reading. The objective of this study was to quantify and validate the relationships between N uptake and grain yield of wheat using in-season measurements by chlorophyll meter and GreenSeeker optical sensor at Zadoks3.0 growth stage (stem elongation) of wheat. In the study, responses of four winter wheat cultivars (Altay2000, Gerek79, Sönmez 2001 and Bezostaja1) to six N rate (0,3,6,9,12 and 15 kgNda -1 ) under rainfed conditions were compared with vegetation indices based on spectral reflection and In-Season Estimates of Yield calculated from these indices. GreenSeekersensor was used for this purpose. Vegetation indices (NDVI) were obtained at growth stages Zadoks2.4, Zadoks3.0, Zadoks3.1 and Zadoks3.2, Zadoks3.0 (stem elongation) was found to be the most realistic reading time. In the last year of the

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Nitrogen sufficiency index for estimating nitrogen fertilizer requirement of irrigated rice

Cited by 3 publications

References 16 publications

Management of plant architecture, spacing and population on the yield of super early common bean

Management of plant architecture, spacing and population on the yield of super early common bean

Emission of nitrous oxide in flooded rice cultivation in tropical area of Brazil

Orta Anadolu Kuru Şartlarında Ekmeklik Buğdayda Optik Sensöre Dayalı Mevsim İçi Azotlu Gübre Kalibrasyon Optimizasyonu

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