Crescimento da mandioca e plantas daninhas em resposta à adubação fosfatada

Pereira, Gustavo Antônio Mendes; Lemos, Vinícius Teixeira; Santos, J.B.; Ferreira, Evander Alves; Silva, Daniel Valadão; Oliveira, Maxwel C.; Menezes, Claubert Wagner Guimarães de

doi:10.1590/s0034-737x2012000500019

Cited by 20 publications

(15 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A similar behavior was observed by Pereira et al (2012), in which was found out that while evaluating the growth of cassava and weeds in response to phosphorous fertilization the fertilization tends to contribute to a faster growing rate for weeds than for cassava. To Carvalho et al (2007a), there is a greater development of the roots in the initial periods of the development cycle of weeds, resulting in an increase of nutrient uptake by radicular interception, leading to a quick accumulation of nutrients by the roots and, consequently, a lower availability for the crop.…”

Section: Resultssupporting

confidence: 78%

Effect of weeds on yield loss of cassava plants in response to NPK fertilization

Soares¹,

Neto²,

JosÃ©³

et al. 2016

Afr. J. Agric. Res.

View full text Add to dashboard Cite

The objective of this study was to assess yield loss of weed-infested cassava and the degree of interference of weeds on the crop productivity in response to the fertilization of NPK. The study was conducted at the Universidade Estadual do Sudoeste da Bahia, in the municipality of Vitória da Conquista, BA, with two different treatment groups that were evaluated in parcels with and without fertilizer. The treatments of the first group consisted of initial coexistence periods in which the cassava plants and weeds were put to live together: 35, 70, 105, 140 and 175 days after planting (DAP); in the second group, the cassava plants, initially, remain free from weeds during the same periods. Weeds were assessed every 35 days, from the 35 to 525 days after planting of cassava, determining the fresh mass of the identified species in the evaluated treatments with and without fertilizers. The characteristics of root yield, shoot weight, harvest index, dry mass of roots, starch content and flour production were evaluated 18 months after plantation. The predominant weeds in the experimental area were: Panicum maximum, Brachiaria plantaginea, Sida rhombifolia, Pavonia cancellata, Portulaca oleracea, Cynodon dactylon and Setaria parviflora. The interference of the weeds in the cassava yield was bigger when the crop was subjected to fertilization, in coexistence periods from the 35 days after planting; however, when cassava plants were kept in the absence or in coexistence with weeds up to 35 DAP, fertilization provided increase in crop productivity factors. The competition with weeds resulted in high losses in root yield of the cassava plant, thus, being necessary the control of the invading plants in the period between 35 and 175 DAP.

show abstract

Section: Resultssupporting

confidence: 78%

Effect of weeds on yield loss of cassava plants in response to NPK fertilization

Soares¹,

Neto²,

JosÃ©³

et al. 2016

Afr. J. Agric. Res.

View full text Add to dashboard Cite

show abstract

“…The P uptake model is corroborated by the production of roots per plant that presented the linear model (Figure 2g). Linear response of cassava roots production as a function of a larger availability of P in the soil was observed by Pereira et al (2012).…”

Section: Resultsmentioning

confidence: 90%

Absorption of macronutrients by cassava in different harvest dates and dosages of nitrogen

Santos¹,

Alves²,

Uchôa³

et al. 2014

Rev. Ciênc. Agron.

View full text Add to dashboard Cite

-A field experiment was carried out in 2010-2011 crop years in the experimental area of the Centro de Ciências Agrárias of the Universidade Federal de Roraima, in Boa Vista, Roraima, Brazil. This study aimed to evaluate the effect of nitrogen availability on the concentrations of N, P, K, Ca, Mg and S in cassava, cultivar Aciolina, in different harvest times. A randomized block design was used in split-plot, with four replications. Dosages of N in cover were applied randomly on the plots (0, 30, 60, 150 and 330 kg ha -1 ), and in the subplot the harvest dates 120, 150, 180, 210, 240, 270 and 300 days after emergence (DAE). The vegetal material was collected, ground and then underwent an analysis for determination of nutrients concentrations in the leaves (N, P, K, Ca Mg and S). The harvest dates and dosages of N affect the nutrient concentrations in the cassava leaves, cv. Aciolina. The macronutrients dosage in the leaves, 120 DAE, is a good indicator of the nutritional status of the cassava plant. The dosage of 150 kg ha -1 of N raises the tubers roots per plant. The sequence of the macronutrients concentration in the leaves of the cassava, cv. Aciolina is N>Ca>K>Mg>P>S.

show abstract

“…BRS Piatã e U. ruziziensis, quando semeadas na densidade de 10 kg ha -1 , aos 24 dias após a emergência da soja, reduziram a produtividade desta cultura de forma distinta, com decréscimos de 3,03 e 16,23%, respectivamente (Saraiva et al, 2013). Diversos autores relatam U. brizantha e B. pilosa como plantas daninhas de grande importância para diversas culturas (Biffe et al, 2010;Pinotti et al, 2010;Camargo et al, 2011;Pereira et al, 2012), inclusive para soja (Oliveira et al, 2013).…”

Section: Introductionunclassified

Interação entre volume de vaso e competição com plantas daninhas sobre o crescimento da soja

et al. 2015

Self Cite

View full text Add to dashboard Cite

Interação entre volume de vaso e competição com plantas daninhas sobre o crescimento da sojaA avaliação dos efeitos da competição das plantas daninhas sobre o crescimento da soja é efetuada por meio de ensaios em ambientes protegidos. Esses ensaios, geralmente, são feitos em recipientes (vasos) em que se testam os efeitos desejados em diferentes épocas de coleta. O tamanho (volume) dos vasos a ser escolhido depende do tipo de estudo, da espécie-teste e das variáveis que serão estudadas. Por esta razão, objetivou-se com este trabalho avaliar o efeito do tamanho de vasos na habilidade competitiva da soja com as plantas daninhas Urochloa brizantha e Bidens pilosa. O experimento foi conduzido em casa de vegetação e o delineamento foi em blocos ao acaso, em esquema fatorial 3 × 5, com quatro repetições. Os fatores considerados no experimento foram três sistemas de competição (soja cultivada isoladamente, soja + U. brizantha e soja + B. pilosa) e cinco volumes dos recipientes (2, 4, 7, 10 e 16 dm 3 ). O crescimento das plantas de soja foi afetado tanto pelo volume dos vasos quanto pela competição com U. brizantha e B. pilosa, sendo que U. brizantha foi mais competitiva com a soja. Vasos com maiores volumes aumentam os efeitos da competição sobre o crescimento da soja. Palavras Interaction between pot size and competition with weeds on soybean growthThe evaluation of competition effects between soybean and weed is carried out in protected environments. These assays are usually conducted in pots to study the desired effects at different sampling/harvest times. The size of the pots varies with the type of study, plant species and the variables that will be studied. Thus, the aim of this work was to evaluate the effect of the pots size on the competitive ability of soybean with the species Urochloa brizantha and Bidens pilosa. The experiment was conducted in a protected environment and was arranged in a 3 × 5 factorial randomized block design with four replications. The factors considered in the experiment were three systems of competition (soybeans grown alone, soybeans + U. brizantha and soybean + B. pilosa) and five pot sizes (2, 4, 7, 10 and 16 dm 3 ). The soybean growth was affected by the pot sizes and the competition with U. brizantha and B. pilosa. U. brizantha was more competitive with soybean than B. pilosa. Pots with larger volumetric capacity increased the effects of the competition on the soybean growth.

show abstract

Crescimento da mandioca e plantas daninhas em resposta à adubação fosfatada

Cited by 20 publications

References 13 publications

Effect of weeds on yield loss of cassava plants in response to NPK fertilization

Effect of weeds on yield loss of cassava plants in response to NPK fertilization

Absorption of macronutrients by cassava in different harvest dates and dosages of nitrogen

Interação entre volume de vaso e competição com plantas daninhas sobre o crescimento da soja

Contact Info

Product

Resources

About