A chemical study of sugar beet during the first growth year

Knowles, Frank; Watkin, J. E.; Hendry, F. W. F.

doi:10.1017/s0021859600007048

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…The loss of phosphorus from the N 2 P plants which did not occur with other treatments, and the entire absence of loss of elements from the N 2 PK plants, are outstanding features of the table. In previous work on wheat (Knowles & Watkin, 1931) and sugar beet (Knowles et al 1934) we have noted losses; in the former plant of potassium, calcium and chlorine, and in the latter of phosphorus and chlorine. Although in the case of wheat our work was concerned only with the aerial parts of the plant, we recorded the opinion that the losses were so large that they were not due to mechanical causes, but to a return of elements to the roots; the losses from beet were suggestive of excretion from roots to the soil.…”

Section: Losses Of Elements Observedmentioning

confidence: 76%

Some effects of fertilizer interactions on growth and composition of the potato plant

Knowles¹,

Watkin²

1940

J. Agric. Sci.

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1. An account has been given of the percentages of nutrients in the dry matter and weights of nutrients in tops, tubers and roots of potato plants throughout growth under six fertilizer treatments.2. Manurial treatment affected dry-matter content of tops but not of tubers.3. Balanced manuring, as represented by N2PK treatment, resulted in tubers in which nitrogen content of dry matter declined with age. The effect of the K was to lower the nitrogen, phosphorus and calcium contents, to increase chlorine content of all parts of the plant, and to maintain a much higher and more constant concentration of potassium in tops and roots. With unbalanced manuring the nitrogen content of the tubers was more constant.4. Manuring with nitrogen only raised the content of potassium in the dry matter of all parts of the plant.5. Nitrogenous manuring, whether alone or in combination, raised the nitrogen content of the dry matter of all parts of the plant, a smaller proportion of which was present as protein. Calcium and chlorine contents were lowered.6. Phosphate manuring in conjunction with nitrogen depressed the concentration of potash in the dry matter of all parts of the plant.7. N2P plants were the first to attain their maximum uptake of all nutrients, namely, about 7 weeks from appearance above ground, at which time N2PK plants had absorbed only 40% of the quantities finally noted.8. No losses of elements were observed in the plants which received balanced manuring (N2PK), but losses of calcium and chlorine occurred in all other plants, amounting on the average to 25 and 37% respectively, but being highest in N2P plants. A significant loss of potassium occurred in N2 plants and a highly suggestive loss of phosphorus occurred in N2P plants.

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Section: Losses Of Elements Observedmentioning

confidence: 76%

Some effects of fertilizer interactions on growth and composition of the potato plant

Knowles¹,

Watkin²

1940

J. Agric. Sci.

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“…Sugar beet is a crop with a long growing season, and Knowles, Watkin & Hendry (1934) showed that nitrogen uptake was highest in July. To see whether the crop is nitrogen-deficient at the end of June when nitrogen had been leached during a wet spring, the experiments also tested a top dressing at the end of June.…”

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confidence: 99%

The value of calcium nitrate and urea for sugar beet, and the effect of late nitrogenous top dressings

Adams¹

1960

J. Agric. Sci.

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1. Twenty-eight experiments on sugar beet in 1956–8 compared ammonium sulphate, calcium nitrate and urea applied to the seedbed before sowing. The three fertilizers were compared at rates which supplied nil, 0·6 and 1·2 cwt. N/acre. Treatments in which 0·6 cwt. N/acre was held back until the end of June were also included.2. Average responses in sugar yield were low, 0·6 cwt. N/acre provided virtually all the nitrogen required for maximum sugar production. The heavier nitrogen dressing, on the other hand, substantially increased the yield of tops.3. Calcium nitrate and urea were as effective as ammonium sulphate at raising sugar yield. There was no damage to germination with any fertilizer, and when urea containing 4·5% biuret was used for topdressing in 1956, no damage was seen. Calcium nitrate and, to a lesser extent, urea produced more tops than ammonium sulphate.4. Putting all the nitrogen into the seedbed was as effective as a split dressing in raising sugar yield. Leaching of nitrogen in a wet summer is therefore not important to sugar beet. Late nitrogen, on the other hand, never harmed sugar production if some had been given to the seedbed.

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“…As has been noted, it was impractical. to obtain green weights generally; hence the data showing the changes with age in the mineral composition of the plant are expressed upon the dry weight basis 7. It will be recognized that the effect of "age" actually includes the combined effects of age and season.…”

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Effect of Age upon the Absorption of Mineral Nutrients by Sugar Cane under Field Conditions¹

Ayres¹

1936

Agronomy Journal

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T HE mineral composition of sugar cane has been employed in Hawaii as an aid in determining the nutrient status of the soil. Conflicting views are held regarding the reliability of the method. It is the belief of the author that the method may lead to serious error unless the effects of other factors which influence the mineral composition of the cane plant are also known. It was the purpose of the phase of the investigation reported in Part I of this paper to determine the effect of one of these factors, namely age, upon the percentage composition of the cane plant.Part II of this publication deals with an investigation of the changing demands whic]J the growing cane crop makes upon the soil for mineral nutrients. Investigations by Stewart (r r) 3 and by the author (r) have shown that the absorption of mineral nutrients is m~ch more rapid at certain periods in the life of the cane plant than at others. Knowledge of these demands at successive stages of growth would enable the agriculturist more nearly to adapt his program of fertilization to meet the needs of the crop. Moreover, if fertilization were largely withheld during periods of negligible absorption, losses of added nutrients by leaching should be reduced. The matter is of particular importance locally in those regions which are subject to an annual rainfall of roo and occasionally 200 inches. EXPERIMENTALThe experimental plat consisted of approximately I ,ooo running feet of cane in rows 5 feet apart. The variety of cane grown in the experiment, H 109, is extensively planted in the Islands and from it is produced nearly half of Hawaii's annual output of sugar. In order to avoid as far as possible any effect upon the

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A chemical study of sugar beet during the first growth year

Cited by 3 publications

References 4 publications

Some effects of fertilizer interactions on growth and composition of the potato plant

Some effects of fertilizer interactions on growth and composition of the potato plant

The value of calcium nitrate and urea for sugar beet, and the effect of late nitrogenous top dressings

Effect of Age upon the Absorption of Mineral Nutrients by Sugar Cane under Field Conditions¹

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A chemical study of sugar beet during the first growth year

Cited by 3 publications

References 4 publications

Some effects of fertilizer interactions on growth and composition of the potato plant

Some effects of fertilizer interactions on growth and composition of the potato plant

The value of calcium nitrate and urea for sugar beet, and the effect of late nitrogenous top dressings

Effect of Age upon the Absorption of Mineral Nutrients by Sugar Cane under Field Conditions1

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Effect of Age upon the Absorption of Mineral Nutrients by Sugar Cane under Field Conditions¹