Disponibilidade de água em alguns solos sob cerrado

Medina, Hanoi; Grohmann, F.

doi:10.1590/s0006-87051966000100006

Cited by 9 publications

(5 citation statements)

References 3 publications

(2 reference statements)

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“…In WW plants, soil moisture values were below 10%, achieved at 15 days, suggesting that soil moisture reached the permanent wilting point (PWP). These upper and lower limits of soil moisture are consistent with those observed by Medina & Grohmann (1996) for savannah soils, which determined the average limits of field capacity and PWP of 28 and 10.4%, respectively. Three days after re-watering, on day 18 of experiment, soil moisture values were similar to the DW treatment.…”

Section: Resultssupporting

confidence: 88%

Changes in carbohydrates accumulation in Viguiera discolor Baker in response to water deficit

Sanches

Silva

Costa

et al. 2019

Hoehnea

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Water stress is an environmental factor that can regulate growth, limit production and lead to physiological and biochemical changes. Plants present a series of adaptive responses to drought, such as osmotic adjustment, in which carbohydrates play an important role. To evaluate the influence of water deficit on carbohydrates accumulation in V. discolor, the plants were divided into two groups: daily watering and water suppression for 14 days being re-watering after this period. Leaves and roots were collected at 0, 3, 6, 9, 12, 15 and 18 days, for ecophysiological and biochemical analyzes. Variations in carbohydrate contents in V. discolor showed a close relationship with changes in the plant water status, with higher concentrations of soluble sugars, total fructans, oligosaccharides, reducing sugars coinciding with the lower values of soil moisture and leaf water potentials and relative water content. In the tuberous roots, there is an increase in carbohydrate concentrations after re-watering. The increase of these low molecular weight carbohydrates is involved in osmotic adjustment and therefore acts to protect against dehydration.

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Section: Resultssupporting

confidence: 88%

Changes in carbohydrates accumulation in Viguiera discolor Baker in response to water deficit

Sanches

Silva

Costa

et al. 2019

Hoehnea

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“…The soil-extractable P was the Mehlich-3 method in units of mg P kg j1 (Lins and Cox, 1989;Mehlich, 1984). Soil clay was determined by dispersion with 0.1 M NaOH (Medina and Grohman, 1986). The determination of PCL was selected as the soil P concentration at maximum net income or 95% of the maximum yield (Lins et al, 1985).…”

Section: Methodsmentioning

confidence: 99%

Predicting Soil Phosphorus Fertilizer Rate Using Hierarchical Segmented Regression Models

Shuai¹,

Yost

Smyth

2011

Soil Science

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Predicting soil phosphorus (P) needs and P fertilizer requirements is important for plant nutrition and reducing environmental risk. The P requirement (PR) can be calculated from three components: the current status of soil P (P 0 ), soil P buffer coefficient (PBC), and the soil P critical level (PCL). The PBC and PCL can be predicted from soil clay content using linear-plateau models. The PR, PBC, and PCL form a hierarchical model because PR depends on PBC and PCL, which, in turn, depend on soil clay content. The objective of this study is to estimate the parameters in this hierarchical model to ensure reasonable performance and behavior of PR in a large range of soil clay contents. Results showed that the linear-plateau model described the change of PBC with soil clay content in the range of 39 to 760 g kg j1 . This model also described the change of PCL with soil clay content in the range of 80 to 760 g kg j1 for six crops, including cotton, cowpea, maize, peanut, soybean, and wheat. The obtained PR showed irregular behavior of PR within soil clay content range from 288 to 357 g kg j1 when PBC and PCL were independently predicted from soil clay. When the join points in the linear-plateau models of PBC and PCL were set to be equal, the irregular change of PR with soil clay content disappeared. The hierarchically modeled system predicts a decrease in PR with increasing current status of soil P and a curve-plateau trend with soil clay content.

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“…Na área do experimento foi retirado um perfil de solo, para análise granulométrlca e determinação da disponibilidade de água. Os resultados foram posteriormente publicados por Medina & Grohmann (6).…”

Section: -Materials E Métodosunclassified

Cultivo de café em latossolo vermelho-amarelo da região de Batatais, SP

Lazzarini¹,

Morais²,

Cervellini³

et al. 1975

Bragantia

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SINOPSESão relatados os resultados de um experimento com cafeelros em latossolo vermelho-amarelo (terra de campo cerrado) de baixíssima fertilidade natural e considerado, na ocasião, como impróprio para as atividades agrícolas normais.Foram comparados sete tratamentos de adubação, sendo três à base de estéreo e quatro à base de fertilizantes exclusivamente químicos, além de um controle não adubado.Foram efetuadas observações sobre o efeito dos vários tratamentos sobre o crescimento e o estado nutritional dos cafeelros em relação com a ocorrência de sintomas de carência de vários elementos.A análise das produções obtidas durante o período 1960/69 revelou que o emprego de adubações exclusivamente químicas em presença de calcário e micro¬ nutrientes foi superior ao emprego de esterco isoladamente e equivalente a este complemento pela adubação química e calagem.O emprego dos micronutrientes e do calcário teve efeito significativo no aumento da produção.O emprego do calcário foi altamente eficaz na correção da carência de magnésio e no aumento da produção.Os resultados obtidos indicam que é viável a exploração econômica do cafeeiro no latossolo vermelho-amarelo de baixa fertilidade, através do uso exclusivo da adubação química.

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Disponibilidade de água em alguns solos sob cerrado

Cited by 9 publications

References 3 publications

Changes in carbohydrates accumulation in Viguiera discolor Baker in response to water deficit

Changes in carbohydrates accumulation in Viguiera discolor Baker in response to water deficit

Predicting Soil Phosphorus Fertilizer Rate Using Hierarchical Segmented Regression Models

Cultivo de café em latossolo vermelho-amarelo da região de Batatais, SP

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