Potassium Research and Agricultural Production - The International ...

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As an average value for all three experimental fields the positive influence of potassium fertilization on the yield of roots was 6,4% and on sugar yield 9,6% (table 11). The AL-method does not show thoroughly enough the concentration of potassium in equilibrium of soil solutions; at the same time it is not equally competent for the assessment of the necessary potassium fertilization on humic-gley and chernozem. Thermal soil analysis is not suited to serial analyses, as it is slow and expensive, but nevertheless it deserves greater attention because it is superior to the AL-method in the determination of ecological potassium in heavy dark soils rich in clay (Tables 12, 13). In the following period great efforts must be made in order to reveal more efficiently and in a more rational way the methods for the determination of ecological potassium in soils rich in clay and of similar properties as those soils examined. Perhaps electroultrafiltration. recommended by Nemerh, will help us in this field. Table 12. Total dry matter yield (per 12 cuts, 1963-1965) and soil dilution K-fertilizer Year Soil dilution mg/IOO g soil 100% 75% 50% 25% 12.5% f,=O 1963 55.4 4S.5 50.3 40.8 29.0 1964 25.5 21.96 26.34 17.5 IS.4 1965 61.5 55.5 63.9 ]7.7 13.3 S 140.4 125.96 140.54 96.0 60.7 g dry matter/lOO g soil 2.34 2.79 4.68 6.4 8.09 fl = 3.35 1963 57.4 59.7 49.4 42.S 27.9 1964 40.14 24.92 28.35 22.47 12.23 1965 47.4 45.0 55.6 30.9 34.9 S 144.94 129.62 133.35 98.17 75.03 g dry matter/lOO g soil 2.41 2.88 4.44 6.54 10.004 fl=6.75 1963 5S.2 56.2 40.3 45.1 29.3 1964 28.01 26.91 30.2 20.4 17.7 1965 57.6 56.5 56.1 36.3 28.5 S 143.81 139.61 126.6 10l.S 75.5 g dry matter/! 00 g soil 2.39 3.10 4.22 6.78 10.06 ft = 13.5 1963 55.6 51.3 50.5 37.1 3S.0 1964 23.91 21.72 22.5 14.4 17.5 1965 62.0 54.7 45.0 39.0 25.0 S 141.51 127.72 IIS.O 90.5 SO.5 g dry matter/lOO g soil 2.35 2.S4 3.93 6.03 10.73 f,=27.0 1963 62.9 55.5 55.8 47.5 39.7 1964 31.2 25.1 21.96 13.7 20.65 1965 60.4 51.7 49.3 34.0 32.5 S 154.5 132.3 127.06 95.2 92.S5 g dry matter/lOO g soil 2.57 2.94 4.23 6.34 12.38 99
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Potassium Research and Agricultural
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Chaudet, P. 1st Working Session SOD
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Drouineau, G. Mathieu, M. Mafavofta
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Chairman: Co-ordinator: 1 si Workin
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of the agricultural wage-earners wa
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for certain industrial crops a mino
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expected to produce fertilizer type
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Organization and Achievements of Ag
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Research expenses are distributed a
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vigorously cultivated. The intensiv
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It became clear that in Congresses
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this balancing effect. On the other
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problems were studied by field and
Page 35 and 36: There is need to relate fertiliser
Page 37: Increase in the fertilisers used in
Page 42 and 43: are easier to use than three separa
Page 44 and 45: of workers, preferably associated b
Page 46 and 47: Chairman: Co-ordinator: 2 nd Workin
Page 49 and 50: Accordingly, K release increases fr
Page 56 and 57: ways satisfactory. If the greater p
Page 58 and 59: The Use of Reagents Containing Sodi
Page 60: tiated by the cultivation practices
Page 63 and 64: terial being an eruptive or crystal
Page 66: G. Dut/lion, C. and Grosman, Ruth:
Page 76 and 77: Potassium Fixation and Assessment o
Page 79: The quantitative and qualitative di
Page 84: Table 6. Average dry matter yield i
Page 98 and 99: cant with both sandy soil varieties
Page 105 and 106: - Attention should be paid to magne
Page 107: tion occurs in much lower amount th
Page 111: N N Table 4. (Lehmann (14J) Influen
Page 119: Potassium Release in Relation to Cr
Page 131 and 132: -, mass flow, by which the potassiu
Page 133: Chairman: Co-ordinator: 3 rd Workin
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At the same time mitochondria swell
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ATP Synthesis and Sjmthesis of Plan
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was increased, when wheat had been
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Table I. Effect of potassium fertil
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Fig. 2. Innuence or potassium rerti
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The Relation Between Potassium and
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The behaviour of potassium is in pr
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Temperature dependence of Potassium
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4. Bibliography I. Bangc. G. G.).:
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movement of the appropriate hormone
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sink. Sections 2.1. and 2.2. sugges
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Tillcker and Darbishire [77J found
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Bibliography I. Addiscoll. T. M.: T
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stationary level of PD for not less
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e quite justified to use the N/K ra
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Nitrogen cOlltent of leaves Accordi
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1/ 2,.0 I 2,aJ. (.0 , , r ! - UfALT
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Phosphorus C()llIenl ()f 1(10 res T
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activated by monovalent cations. Th
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Chairman: Co-ordinator: 4 th Workin
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Table 1. Acreage and production of
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Table .5. Responses to K in rice on
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of release of K from this soil was
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Grams of nutrients ab$Orbed per pla
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When the experiments were conducted
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Africa. This work was only possible
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and translocation of synthesized pr
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templated, trials of medium term, e
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12. Sobulo, R.A.: Evaluation of ana
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open to human occupation. A closer
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N Table 2-1. The soil regions of La
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2.4. Main barriers for better utili
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Table 2-5. A summary of results of
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Table 3-4. Estimate of the rertilis
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Table I. The Phases or Land Cultiva
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Table 3. (a) Approximate nutrient r
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Table 6. Changes in Ihe soil after
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soil when a woody natural fallow is
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25. Nye, P. H. and Slephens, D.: 'S
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on the part of farmers involved in
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The usually marked deficiency of P
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Potassium and the Environment A. Do
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Application of Plant Nutrients Base
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I. taken up by the crop 2. forming
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tassium is being increasingly used
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With the bigger crops obtained from
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A few analyses from fields on Askov
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tention to the animal manure, which
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38. Del's, W. B.: Die Bestimmung de
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potash in this manner on loess soil
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