Studies on potassium nutrition of plants. I.—Effects of potassium concentration on growth and mineral composition of vegetable seedlings in sand culture

Freeman, G. G.

doi:10.1002/jsfa.2740180410

Cited by 16 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ca content of plants (4,9,11,13,16,17,22). Lazaroff and Pitman (13) found the depressive effect of monovalent cations on Ca content to be confined to the tops of barley plants and to occur only at high concentrations of monovalent cations (5000-60,000 /AI Na + K).…”

Section: Inereasinig Coneentrations Of K Generally Depressmentioning

confidence: 99%

Interactions Between Potassium and Calcium in Their Absorption by Intact Barley Plants. I. Effects of Potassium on Calcium Absorption

1968

View full text Add to dashboard Cite

Section: Inereasinig Coneentrations Of K Generally Depressmentioning

confidence: 99%

Interactions Between Potassium and Calcium in Their Absorption by Intact Barley Plants. I. Effects of Potassium on Calcium Absorption

1968

View full text Add to dashboard Cite

“…Potassium and sodium values were characteristic of these components of cabbage seedlings grown at the stated potassium concentrations in the medium. 8 The effect of potassium nutrition on the ionic balance of potassium and sodium and of potassium and calcium plus magnesium has been reported and discussed in earlier papers in this ~e r i e s .~J~ 'Protein' contents (total N x 6.25) varied slightly from K O to K5.0 but the variation was small compared with that of the ,corresponding values of K and Na and it was concluded that this component showed no definite trend with changes of leaf potassium content. A curve relating sugar content with potassium concentration in the growth medium (not reproduced here) rose steeply and almost linearly from KO.05 to K0.25 and then flattened out at the highest K + concentrations.…”

Section: Results and Discussion Effect Of Potassium Nutrition On Leafmentioning

confidence: 99%

Studies on potassium nutrition of plants IV.—Effect of potassium nutrition on the composition of leaves of cabbage seedlings (Brassica oleracea capitata)

Freeman¹,

Mossadeghi²

1970

J Sci Food Agric

Self Cite

View full text Add to dashboard Cite

The effect of potassium concentration in the nutrient medium on the composition of leaves of cabbage seedlings has been investigated. The plants were grown in sand culture with seven treatments ranging from extreme deficiency to relatively high potassium concentration. The total amounts of the mineral components were not influenced by the level of potassium nutrition. Similarly, proteins, amino acids and other organic nitrogen components, taken as a whole, did not vary appreciably as shown by the constancy of the Kjeldahl nitrogen values.Sugar (reducing sugars + sucrose) content rose with increasing potassium concentration in the medium to a maximum (11 .OX) at 2.5 meauiv./l and fell slightly at the highest K+ concentration. Starch content varied in a similar manner but vdues were, in general, less than half those of the corresponding sugar contents. Total organic acids content was at a maximum (18.6%) when K+ concentration ip the medium was 0.1 mequiv./l and fell to a minimum (7.7%) at a K+ concentration of 2.5 mequiv./l. Other carbohydrates' (the difference between content of 70 % [by vol.] alcohol-insoluble residue and Kjeldahl nitrogen x 6.25) also contributed to the balance of percentage composition; the content rose to a maximum (35.2%) at a K+ concentration of 2.5 mequiv./l and fell off both at higher and lower K+ concentrations. Within the limits of experimental error, the totals of the leaf components determined were constant over the range of potassium concentrations of 0.1-5.0 mequiv./l in the medium and, on average, 90.7% of the dried leaf was accounted for.Similar differences in mineral composition and 'protein', sugars and starch contents were found in plant fractions of different leaf ages in potassium deficiency. The differences were related to differences in potassium content which decreased with increasing leaf age. IntroductionSeveral authorsl-7 have described how potassium deficiency influenced the total quantities of organic acids in leaves and the relative proportions of certain acids. In the cases of broad bean ( Vicia faba),2 Bryophyllum diagremontianum Berger,3 tomato,4 orchard grass,5 and cabbage, red beet and potato leaves,7 potassium deficiency resulted in large increases of total organic acids. It follows that there must be a corresponding decrease in the content of some other component or components to maintain the balance of leaf composition. The object of the present work was to determine how the balance of percentage dry weight composition was main-

show abstract

“…This was due to the higher K concentration in the soil and oil palm leaf in the EFB treatment. According to Lazaroff and Pitman (1966) and Freeman (1967), high K concentration reduces Ca uptake by plants. In this study, the effect of EFB on increasing soil Ca concentration (Fig.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Four Soil Conservation Practices in a Non‐Terraced Oil Palm Plantation

Moradi

Teh

Joo³

et al. 2012

Agronomy Journal

View full text Add to dashboard Cite

In Malaysia, four soil conservation practices are oft en recommended for non-terraced oil palm (Elaeis guineensis Jacq.) plantations. Th ese practices are oil palm empty fruit bunches (EFB), Ecomat (a compressed EFB mat; ECO), and pruned oil palm fronds. Th ese three oil palm residues are used as organic mulching materials. Th e fourth method is silt pits (SIL) which are soil trenches to collect nutrients from runoff water and later redistribute them back into the soil. Nonetheless, the relative eff ectiveness of these four methods in improving soil and oil palm properties have never been studied. A 3-yr fi eld experiment was consequently conducted to determine their relative eff ects on increasing soil chemical properties (pH, cation exchange capacity, organic C, total N, available P, and exchangeable K, Ca, and Mg) and oil palm nutrition levels (N, P, K, Ca, and Mg). Biomass decomposition rate and nutrients release rate in the fi eld by the three mulching materials were also determined. Results showed that EFB mulching was signifi cantly better than the other three soil conservation practices in improving nearly all of the measured soil and plant parameters. Empty fruit bunches was most eff ective partly because of the combined eff ects of higher amounts of dry matter added and the higher nutrient concentrations in the EFB than in other mulching materials. Silt pitting was found not to be as eff ective as EFB because SIL could only trap and return nutrients back into the soil, whereas EFB could do both: trap nutrients and release additional nutrients into the soil as it decomposes.

show abstract

Studies on potassium nutrition of plants. I.—Effects of potassium concentration on growth and mineral composition of vegetable seedlings in sand culture

Cited by 16 publications

References 10 publications

Interactions Between Potassium and Calcium in Their Absorption by Intact Barley Plants. I. Effects of Potassium on Calcium Absorption

Interactions Between Potassium and Calcium in Their Absorption by Intact Barley Plants. I. Effects of Potassium on Calcium Absorption

Studies on potassium nutrition of plants IV.—Effect of potassium nutrition on the composition of leaves of cabbage seedlings (Brassica oleracea capitata)

Evaluation of Four Soil Conservation Practices in a Non‐Terraced Oil Palm Plantation

Contact Info

Product

Resources

About