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Capó, Bernardo G.; Samuels, George

doi:10.46429/jaupr.v37i4.12740

Cited by 1 publication

(3 citation statements)

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“…3 Y' = mean yield in hundredweights of grain per acre estimated with the fitted equation. 4 Sy e y e = sum of squares of deviations of the estimated from the observed mean yields. firmed in the other experiments underway, this would mean that sugarcane growers need to exercise a greater care in maintaining the available nitrogen and magnesium contents of their fields as close as possible to their respective optimum concentrations than for phosphorus, potassium, and calcium.…”

Section: Discussion Of Resultsmentioning

confidence: 99%

“…3 Y' = mean yield in tons of cane per acre estimated with the fitted equation. 4 From the yield of 1 plot only. 6 Sy e y e = sum of squares of deviations of the estimated from the observed mean yields.…”

Section: Statistical Calculationsmentioning

confidence: 99%

“…The Mitscherlich's modified equation (7). 4. A curve the concavity of which changes from concave upwards to concave downwards at a certain point of inflexion, approaching beyond this point a maximum value as an asymptote.…”

Section: Introductionmentioning

confidence: 99%

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Additional Evidence on the Applicability of the New Fertilizer-Yield Relation

Capó¹

1967

JAUPR

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A new fertilizer-yield equation recently discovered by the author was used to describe the relation between the applications of nitrogen-, phosphorus-, potassium-, calcium-, and magnesium-bearing materials and the yields of sugarcane and corn in 34 experiments carried out in various regions of Puerto Rico near Isabela, Gurabo, Patillas, Lajas, and Río Piedras. The equation under study satisfactorily fitted such fertilizer-yield data, even in cases where the fertilizer-yield equation suggested by other workers do not apply. The general applicability of the new fertilizer-yield equation even in cases of certain abnormal data has been noted. From the data studied, it seems that, as concerns the production of sugarcane in soils similar to those used in the above-mentioned experiments, there is more need to keep the available soil nitrogen and magnesium contents as near as possible to their optimum equilibrium values than is true of phosphorus, potassium, and calcium. In corn production the equilibrium of the available nitrogen, phosphorus, and magnesium seems to be more important than that of the available potassium and calcium.

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Section: Discussion Of Resultsmentioning

confidence: 99%

Section: Statistical Calculationsmentioning

confidence: 99%