Nitrogen and Potassium in Narrow-Row Cotton

Kappes, Claudinei; Zancanaro, Leandro; Francisco, Eros Artur Bohac

doi:10.1590/18069657rbcs20150103

Cited by 2 publications

(5 citation statements)

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“…Nas doses de 40 e de 80 kg ha -1 , as taxas de incremento estimadas foram de 1,9 e de 0,8 kg ha -1 de fibra para cada kg de K 2 O, respectivamente. Kappes et al (2015) encontraram incrementos de 3,4 a 5,5 kg ha -1 de algodão em caroço para cada kg de K 2 O, aplicado em sistema de produção adensado, em segunda safra. Kappes et al (2015), Baraich et al (2012), Oliveira et al (2008) e Boquet et al (2004).…”

Section: Resultsunclassified

“…Kappes et al (2015) encontraram incrementos de 3,4 a 5,5 kg ha -1 de algodão em caroço para cada kg de K 2 O, aplicado em sistema de produção adensado, em segunda safra. Kappes et al (2015), Baraich et al (2012), Oliveira et al (2008) e Boquet et al (2004). No entanto, Furlani Júnior et al (2003) NCP -número de capulhos por planta; MC -massa de capulho; Prod.…”

Section: Resultsunclassified

“…A equação da razão incremental de kg de fibra por kg de N (dy/dx = 5,9 -0,0374x), obtida pela derivada primeira da equação de regressão, indicou taxas de incremento , as taxas de incremento estimadas foram de 4,0 e de 2,0 kg ha -1 de fibra, para cada kg de N, respectivamente. Kappes et al (2015) encontraram incremento de 5,7 kg ha -1 de algodão em caroço para cada kg de N, aplicado em sistema de produção adensado, em segunda safra.…”

Section: Ncpunclassified

“…Mesmo comportamento foi encontrado por Kappes et al (2015). Com base nas equações de razão incremental, entre as doses estimadas de 1 a 80 kg, observa-se que o incremento de fibra para cada kg de N foi mais que o dobro, em comparação com o incremento com cada kg de K 2 O. Portanto, o algodoeiro semeado em segunda safra, em sistema adensado, foi mais responsivo à adubação nitrogenada, sendo as doses de máxima eficiência produtiva, para N, de 148, e para K 2 O, de 107 kg ha -1 , respectivamente.…”

Section: Ncpunclassified

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Produtividade do algodoeiro adensado em segunda safra em resposta à adubação nitrogenada e potássica

et al. 2017

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Produtividade do algodoeiro adensado em segunda safra em resposta à adubação nitrogenada e potássica 1 O nitrogênio e o potássio são os nutrientes mais requeridos pelo algodoeiro. O algodão, cultivado em segunda safra, após a colheita da soja, tem sido uma opção dentro dos sistemas de produção do cerrado brasileiro. Este trabalho objetivou avaliar o efeito das adubações nitrogenada e potássica sobre o estado nutricional, os componentes de produção e a produtividade do algodoeiro, cultivado em sistema adensado, semeado em segunda safra. O experimento foi conduzido após a colheita da soja e em delineamento de blocos ao acaso com quatro repetições. Yield of cotton as a second crop in narrow planting in response to nitrogen and potassium fertilizationNitrogen and potassium are the most required nutrients for cotton crop. Cotton grown as a second crop, after soybean harvesting, has been an option for crop system in the Brazilian savanna. This study aimed to evaluate the effect of N and K fertilization on the nutritional status and the yield components of cotton grown as a second crop, after soybean, and in a narrow planting system. The experiment was carried out adopting a completely randomized block experimental design. The treatments were set up in a 4 × 4 factorial arrangement with four replications. Factor A was the four N doses (0, 50, 100, and 200 kg ha -1 ) and factor B was four K 2 O doses (0, 40, 80, and 160 kg ha -1 ), applied as side-dressing. The N and Mg concentration levels in the leaf increased linearly with the N doses, while the concentration levels of S and Fe decreased (quadratic effect). The K 2 O doses resulted in positive and negative effects on K and Mg, respectively, in the leaf. The N fertilization promoted higher lint yield response when compared with K fertilization, as lint yield rate per kg of N was twice the yield rate per kg of K 2 O. The highest lint yields were reached with 148 kg ha -1 and 107 kg ha -1 of N and K 2 O, respectively.

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Section: Resultsunclassified

Section: Ncpunclassified

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Produtividade do algodoeiro adensado em segunda safra em resposta à adubação nitrogenada e potássica

et al. 2017

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“…The “ultra-narrow row cotton” (UNRC) technology, i.e., cotton grown in ultra-narrow rows, has the potential to optimize cotton yield and/or phenology, to reduce costs by increasing yield per cultivated area 1 . In Brazil, especially in the Middle West, narrow row spacing in cotton favors the possibility of growing two crops within a season and its use in crop rotation 2 . In another hands it is possible that dense planting of a plant species does not always increases yield because plant density also affects the interactions among plants, insect pests, plant pathogens, natural enemies, and volunteer plants.…”

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Multivariate approach to quantitative analysis of Aphis gossypii Glover (Hemiptera: Aphididae) and their natural enemy populations at different cotton spacings

Malaquias

Ramalho

Dias

et al. 2017

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The relationship between pests and natural enemies using multivariate analysis on cotton in different spacing has not been documented yet. Using multivariate approaches is possible to optimize strategies to control Aphis gossypii at different crop spacings because the possibility of a better use of the aphid sampling strategies as well as the conservation and release of its natural enemies. The aims of the study were (i) to characterize the temporal abundance data of aphids and its natural enemies using principal components, (ii) to analyze the degree of correlation between the insects and between groups of variables (pests and natural enemies), (iii) to identify the main natural enemies responsible for regulating A. gossypii populations, and (iv) to investigate the similarities in arthropod occurrence patterns at different spacings of cotton crops over two seasons. High correlations in the occurrence of Scymnus rubicundus with aphids are shown through principal component analysis and through the important role the species plays in canonical correlation analysis. Clustering the presence of apterous aphids matches the pattern verified for Chrysoperla externa at the three different spacings between rows. Our results indicate that S. rubicundus is the main candidate to regulate the aphid populations in all spacings studied.

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Nitrogen and Potassium in Narrow-Row Cotton

Cited by 2 publications

References 5 publications

Produtividade do algodoeiro adensado em segunda safra em resposta à adubação nitrogenada e potássica

Produtividade do algodoeiro adensado em segunda safra em resposta à adubação nitrogenada e potássica

Multivariate approach to quantitative analysis of Aphis gossypii Glover (Hemiptera: Aphididae) and their natural enemy populations at different cotton spacings

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