Modo e época de aplicação de adubos minerais em cultura de mandioca

Normanha, E. S.; Pereira, A. S. Rodrigues; Freire, E. S.

doi:10.1590/s0006-87051968000100012

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…The recommended rate of N, however, is generally fairly low (12-80 kg/ha) (4), as would be expected for a long . In some instances, when either the yields were low (7) or the cassava was allowed to grow for 18-21 months (5,6), there was no response to fertilizer N. Presumably, Llanera with its high yields and protein content would require higher rates of N for maximum yield than do other varieties reported in the literature.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitrogen Fertilization on Yields and Nitrogen Content of Cassava, Llanera Cultivar

Fox¹,

Talleyrand²,

Scott³

1975

JAUPR

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Experiments were conducted on two Ultisols in the interior of Puerto Rico to determine the fertilizer N requirements of a high yielding, high root protein variety of cassava (Manihot esculenta Crantz cv. Llanera) from Colombia. This variety appeared to be daylength sensitive and top growth ceased from mid November to mid-February, when days were shorter than 11 1/2 hours. At Corozal (Humatas clay), the crop was grown from mid- March to mid-December and top growth responded strongly and root growth moderately to applied N. High N rates produced low root/top ratios (.67-87) but, due to the experience at the Cidra site, it is assumed that root/top ratios would have increased to higher levels had the crop continued to grow. Apparent recovery of fertilizer N was high (68-69 percent) for the 40 and 80 kg/ha rates. At Cidra (Torres clay), where the crop grew from mid-June until the following May and was dormant for the three winter months, there was no response to N, the top yields were lower but the root/top ratios were higher (average, 1.37) and were not affected by N rates. The lack of response to N was due to the high N supplying power of this soil. The maximum root yields were 23 metric tons/ha at Corozal and 33 metric tons/ha at Cidra. Plants in the highest yielding treatments contained 125-175 kg/ha N. Assuming all N was protein N, unpeeled root protein contents averaged 3.4 percent and peeled 2.3 percent on a dry weight basis and were increased only slightly by higher N rates. The N content of the 4th and 5th fully expanded leaves 4-5 months after planting was very well correlated with final root yield at Corozal (R2 = .99 for 0-160 kg/ha N rates). It appears that a minimum of 5 percent N in these leaves 2 1/2 months after planting is necessary for maximum yields.

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Section: Introductionmentioning

confidence: 99%

Effect of Nitrogen Fertilization on Yields and Nitrogen Content of Cassava, Llanera Cultivar

Fox¹,

Talleyrand²,

Scott³

1975

JAUPR

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Potassium management effects on yield and quality of cassava varieties in tropical sandy soils

Gazola

Fernandes

Hellmeister

et al. 2022

Crop & Pasture Science

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Potassium (K) fertilisation at planting time may not be sufficient to achieve high cassava yields. Experiments were conducted over two growing periods using sweet cassava (SC) variety IAC 576-70 and bitter cassava (BC) variety IAC 13 aiming to evaluate the effects of K fertilisation rate (0–150 kg K/ha) and timing of application (one, two, or three) on leaf K concentration, yield components, and storage-root and starch yields. The SC and BC varieties were grown in a randomized block design in a 3 × 4 + 1 factorial scheme with four replications during growing periods of 10 and 20 months respectively. For SC, split application of K at planting plus 3 months after planting (MP) or at planting plus 1.5 and 3 MP was more effective at increasing the marketable root yield, with greater rainfall at the beginning of the growing period. Split application of K at planting plus 3 MP also reduced the cooking time and cooked root firmness. For BC, split application of K at planting plus 12 MP more effectively increased the storage-root and starch yields; however, root yield response to K fertilisation in the second growing period, with greater rain intensity during the initial crop stages, was greater than in the first growing period. In K-deficient soils, the optimal K application rate for SC marketable root yield varied from 79 to 111 kg/ha when K was applied after 1.5 MP, and linear responses to K application rate occurred when K was applied earlier. For BC, the optimal K application rate varied from 75 to 92 kg K/ha. Our data suggest that K application times should be different for cassava varieties with short and long growing periods.

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Influência da aplicação de adubos minerais nos sulcos de plantio, sobre os "stands" de culturas de mandioca

Silva¹,

Freire

1968

Bragantia

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SINOPSEO efeito do calcário e de alguns adubos sôbre os "stands" de culturas de mandioca foi estudado em solos arenosos. Em três experiências fatoriais, o calcário aplicado a lanço e o sulfato de amônio em cobertura não modificaram os "stands", ao passo que o superfosfato simples e o cloreto de potássio, empregados nos sulcos de plantio, provocaram substanciais e significativas reduções. Em três outras experiências, em blocos ao acaso, a aplicação de superfosfato simples + cloreto de potássio nos sulcos de plantio, completada com a de sulfato de amônio em cobertura, também causou substanciais reduções em relação aos "stands" dos tratamentos sem adubo, mas somente em duas das experiências essas reduções alcançaram significância estatística.

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Modo e época de aplicação de adubos minerais em cultura de mandioca

Cited by 4 publications

References 3 publications

Effect of Nitrogen Fertilization on Yields and Nitrogen Content of Cassava, Llanera Cultivar

Effect of Nitrogen Fertilization on Yields and Nitrogen Content of Cassava, Llanera Cultivar

Potassium management effects on yield and quality of cassava varieties in tropical sandy soils

Influência da aplicação de adubos minerais nos sulcos de plantio, sobre os "stands" de culturas de mandioca

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