Uso do clorofilômetro no manejo da adubação nitrogenada do capim marandu e do capim mombaça

Salman, A. K. D.; Bacelar, B. M. F. S.; Alves, Eliseu; Cruz, Pedro Gomes da; Mendes, A. M.; Carvalho, G. A. de

doi:10.22256/pubvet.v10n11.844-854

Cited by 2 publications

(2 citation statements)

References 9 publications

(11 reference statements)

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“…In Brazil, the application of nitrogen doses of 0, 50, 100, 150, and 200 kg ha 1 to Brachiaria decumbens resulted in an increase of the color (green) of the leaves, with intervals of 32 to 54 and 30 to 48 SPAD units, in the first and second cut, respectively (da Silva et al, 2013). In another study, Salman et al (2016) reported foliar chlorophyll values of 48.4 for marandu grass and 40.7 for Guinea grass; these values are consistent with the results of the present work.…”

Section: Chlorophyll Content Of Leavessupporting

confidence: 92%

Forage yield of Guinea grass (Megathyrsus maximus Jacq.) using mineral fertilization during two seasons of the year

Hernández

Valenzuela-Haro

Morales-Terán

et al. 2022

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Objective: To determine the dry matter yield of Guinea grass (M. maximus Jacq.) in response to mineral fertilization with N-P-K in a tropical humid climate. Design/Methodology/Approach: We conducted an experiment with Guinea grass in Loma Bonita, Oaxaca, Mexico, during the cold front season (November 2018 to February 2019) and the dry season (March to May 2019). The following N-P-K fertilization formulations were used: 00-00-00, 100-00-00, 140-20-00, 180-40-20, 200-00-00, 240-40-20, 260-60-40, and 300-00-00. The response variables were: plant height (cm), chlorophyll content, and dry matter yield (kg ha-1). Results: The fertilization with the highest nitrogen, phosphorus, and potassium levels (p£0.05) increased the dry matter yield, the chlorophyll content, and the height of the Guinea grass above the control. Study Limitations/Implications: Mineral fertilization improved the productive performance of Guinea grass. However, studying more seasons is necessary to validate the results obtained. Findings/Conclusions: The fertilizer formulas with 260-60-40 and 240-40-20 N-P-K units improved the productive performance of Guinea grass. Consequently, the season of the year had a considerable influence on grass yield in a humid tropical climate

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Section: Chlorophyll Content Of Leavessupporting

confidence: 92%

Forage yield of Guinea grass (Megathyrsus maximus Jacq.) using mineral fertilization during two seasons of the year

Hernández

Valenzuela-Haro

Morales-Terán

et al. 2022

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“…Between the two cycles, higher DB yield means were obtained in the second. Salman et al (2016), evaluating the use of NSI of 0.96,0.93,0.90,0.87,and 0.83 in the management of nitrogen fertilization of Marandu and Mombaça grasses, in two cuts, concluded that the lowest indices were the most suitable because they provided greater dry matter with a lower dose of N.…”

Section: Results E Discussionmentioning

confidence: 99%

Mombaça grass yield as a function of nitrogen fertilization based on the use of the chlorophyll meter

Backes¹,

Godoy²,

Santos³

et al. 2021

Semina: Ciênc. Agrár.

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The objective of this study was to evaluate the yield and agronomic efficiency of mombaça grass achieved with the management of nitrogen fertilization, based on the nitrogen sufficiency index (NSI) calculated using measurements obtained with a chlorophyll meter. The experiment was conducted in the field, in São Luís de Montes Belos - GO, Brazil, from November 2016 to May 2018, as a randomized-block design with six treatments and five replicates. Treatments consisted of six N fertilization management strategies (M), namely, M1 - reference, with 150 kg ha-1 N per application; M2 - recommended, with 50 kg ha-1 N per application; M3 - 50 kg ha-1 N when NSI < 98%; M4 - 50 kg ha-1 N when NSI < 94%; M5 - 50 kg ha-1 N when NSI < 90%; and M6 - control treatment, without N application. The NSI was monitored based on the relative chlorophyll content obtained with the chlorophyll meter. Forage canopy height, tiller density, and yield were evaluated. At the end of the 2nd cycle, the recommended, reference, NSI98%, NSI94%, and NSI90% treatments had received 1,050, 350, 300, 250, and 0 kg N ha-1. Control treatment obtained the lowest dry biomass yield, whereas the recommended, NSI98%, and NSI94% treatments showed the highest. Thus, N doses between 1,950 and 300 kg ha-1, in the second cycle, provided statistically equivalent yields in mombaça grass. Considering the DM of both evaluation cycles, the highest yield was achieved with the NSI98% and NSI94% treatments. The application of N doses of 250 to 1050 kg ha-1 provided similar yields. Therefore, the adoption of a nitrogen sufficiency index below 98% and 94% as a parameter allows a reduction and rational use of nitrogen fertilizer.

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Uso do clorofilômetro no manejo da adubação nitrogenada do capim marandu e do capim mombaça

Cited by 2 publications

References 9 publications

Forage yield of Guinea grass (Megathyrsus maximus Jacq.) using mineral fertilization during two seasons of the year

Forage yield of Guinea grass (Megathyrsus maximus Jacq.) using mineral fertilization during two seasons of the year

Mombaça grass yield as a function of nitrogen fertilization based on the use of the chlorophyll meter

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