Absorção e translocação de fósforo em dois cultivares de mamoneira (Ricinus communis L.), 'Campinas' e 'Guarani', com uso de 32p

Nakagawa, J.; Neptune, André Martin Louis; Muraoka, Takashi

doi:10.1590/s0071-12761982000100021

Cited by 4 publications

(1 citation statement)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, as K is also involved in the translocation of carbohydrates synthesized in the photosynthetic process (Marschner, 1995), the sharp increase in reproductive structures growth also increased their K demand. In the season crop, the highest P contents occurred in reproductive structures (Table 2), which is because this nutrient is accumulated in larger ratios in castor plant grains than in the plant biomass (Nakagawa et al, 1982;Crusciol et al, 2012a), and more than 80% of all P contained in castor plant fruits are present in the seeds (Hocking, 1982). However, in the off-season, P contents of reproductive structures did not differ from leaf contents, possibly due to the effect of content concentration in leaves, as the offseason leaf DM was 3.2 times lower than in season (Table 2 and Figures 2e, f, g, h).…”

Section: Resultsmentioning

confidence: 99%

Dry matter and nutrient partitioning in Castor plants in two growing seasons

Castro¹,

Crusciol²,

Fernandes³

et al. 2017

Científica

View full text Add to dashboard Cite

The aim of the present study was to evaluate dry matter partitioning and macro-and micronutrient accumulation and distribution in small-sized castor plants grown in season and off-season. The experiments were conducted during the 2005-2006 season and in the 2006 off-season in an Oxisol. A completely randomized block design was used, with eight replications. Plots consisted of plant sampling periods, which were conducted in the vegetative period (17 days after emergence -DAE), the grain fill period (between 73 and 80 DAE) and at end of the cycle (120 DAE). Castor leaves accumulated most of dry matter (DM) and macroand micronutrients in the vegetative period, regardless of the growing period. In the following cycle periods, most of biomass and nutrients were located in the reproductive structures and grains, especially in the offseason crop. It was concluded that leaves and stems are strong nutrient sinks in the castor plant in season crops, while lower water availability during off-season induces plants to use physiological mechanisms to allocate more resources (biomass and nutrients) for their reproduction.Additional keywords: dry matter; macronutrients; micronutrients; Ricinus communis; source/sink relation. ResumoObjetivou-se neste estudo avaliar a partição de matéria seca, o acúmulo e a distribuição de macro e micronutrientes em mamona de porte baixo, cultivada na safra e na safrinha. Os experimentos foram conduzidos na safra de 2005-2006 e na safrinha de 2006, em Latossolo Vermelho distroférrico. Utilizou-se do delineamento em blocos casualizados, com oito repetições. As parcelas foram constituídas pelas épocas de coleta de plantas, que foram realizadas na fase vegetativa (17 dias após a emergência -DAE), na fase de enchimento de grãos (entre 73 e 80 DAE) e no final do ciclo (120 DAE). As folhas da mamoneira, na fase vegetativa, acumularam a maior parte da matéria seca (MS) e dos macros e micronutrientes, independentemente da época de cultivo. Nas fases seguintes do ciclo, a maior proporção de biomassa e nutrientes estava presente nas estruturas reprodutivas e nos grãos, especialmente no cultivo de safrinha. Conclui-se que, no cultivo de safra, as folhas e os caules são fortes drenos de nutrientes na planta de mamona, enquanto na safrinha a menor disponibilidade hídrica faz com que as plantas utilizem mecanismos fisiológicos para alocar mais recursos (biomassa e nutrientes) para sua reprodução.Palavras-chave adicionais: macronutrientes; matéria seca; micronutrientes; relação fonte/dreno; Ricinus communis.

show abstract

Section: Resultsmentioning

confidence: 99%

Dry matter and nutrient partitioning in Castor plants in two growing seasons

Castro¹,

Crusciol²,

Fernandes³

et al. 2017

Científica

View full text Add to dashboard Cite

show abstract

Nutrient extraction and exportation by castor bean hybrid lyra

Nascimento¹,

Crusciol

Fernandes

et al. 2012

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

show abstract

Deficiências de macronutrientes no estado nutricional da mamoneira cultivar Iris

Lavres

Boaretto

Silva

et al. 2005

Pesq. agropec. bras.

View full text Add to dashboard Cite

Resumo -Os objetivos deste trabalho foram avaliar o efeito da deficiência dos macronutrientes no crescimento e estado nutricional da mamoneira (Ricinus communis L.) e a obtenção do quadro sintomatológico das deficiên-cias de N, P, K, Ca, Mg e S. Cultivou-se Ricinus communis L. cultivar Iris em solução nutritiva, tendo como tratamentos soluções completa e deficientes em N, P, K, Ca, Mg e S. Foram determinadas a concentração indireta de clorofila, a atividade da redutase do nitrato, os teores solúveis de N (NO 3 -), P (H 2 PO 4 -) e K + e realizados testes rápidos para N, P e K. As deficiências de N, Ca, S e Mg foram as que mais restringiram a produção de massa de matéria seca, na ordem decrescente: N>Ca>S>Mg>K>P. Os maiores acúmulos de macronutrientes, no tratamento completo, foram observados nas raízes e no limbo das folhas inferiores. As concentrações críticas para N e Ca, ambas no limbo das folhas superiores e, Mg, no pecíolo das inferiores foram, respectivamente, 46,7, 13,8 e 6,5 g kg -1 . As deficiências influenciaram as leituras do clorofilômetro. A atividade da redutase do nitrato guardou relação direta com a determinação da clorofila. Os teores de N (NO 3 -), P (H 2 PO 4 -) e K + foram menores nas folhas deficientes em N, P e K, respectivamente, o mesmo acontecendo quando avaliadas pela análise de toque.Termos para indexação: Ricinus communis, clorofilômetro, nutrição, sintomas. Deficiencies of macronutrients on nutritional status of castor bean cultivar IrisAbstract -The objectives of this work were to evaluate the effect of macronutrient deficiencies on growth and on nutritional status of castor beans (Ricinus communis L.), and to obtain the symptoms of the lack of N, P, K, Ca, Mg and S. Nutrient solutions containing all macronutrients and those from which one of these elements was omitted were the treatments used. The following determinations were made: chlorophyll (indirectly), nitrate reductase activity, NO 3 --N, H 2 PO 4 --P and K + , both on soluble fractions, and by spot tests. Deficiencies of N, Ca, S and Mg were the most limiting for dry matter production, followed in decreasing order by those of K and P. The highest concentrations of macronutrients were measured in roots and lower leaf blades. Critical levels of N and Ca in the upper leaf blades and of Mg in lower petioles were respectively, 46.7, 13.8, 6.5 g kg -1. Deficiencies affected chlorophyll meter readings. Nitrate reductase activity was correlated with chlorophyll readings. Soluble contents of N, P and K in the leaves were lower in plants deficient in the respective element. The same was found when spot tests were applied on the leaf sap.

show abstract

Absorção e translocação de fósforo em dois cultivares de mamoneira (Ricinus communis L.), 'Campinas' e 'Guarani', com uso de 32p

Cited by 4 publications

References 4 publications

Dry matter and nutrient partitioning in Castor plants in two growing seasons

Dry matter and nutrient partitioning in Castor plants in two growing seasons

Nutrient extraction and exportation by castor bean hybrid lyra

Deficiências de macronutrientes no estado nutricional da mamoneira cultivar Iris

Contact Info

Product

Resources

About