international fertilizer correspondent
No 3
international fertilizer correspondent No 3 |
|
Lalitha, B.S. et al.: Influence of potassium and sulphur
levels on growth, yield and quality of potato raised through seed tuber and
true potato seed (TPS). J. Indian Potato Assoc. 24: 74-78, 1997
Potatoes, whether raised from seed tubers or true seeds, responded very
positively on potash, especially when combined with sulphur. K application (125
kg/ha K2O) significantly increased the yield over 100 kg/ha
K2O. The trend in the leaf area index, leaf area duration and other
yield attributes followed that of tuber yield. Also the tuber grade improved
with increase in K use. Potassium application produced tubers with high content
of starch and crude protein. Combined application of K and S recorded the
highest net returns.
Lalitha, B.S. et al.: Balance sheet of available
potassium and sulphur as influenced by K and S application in seed tuber and
true potato seed raised crop. J. Indian Potato Assoc. 24: 171-173, 1997
Combined application of compost (148 kg/ha K2O) and potash (100 to
150 kg/ha K2O) resulted in positive K balances. However, the actual
K balance, i.e. available K present in the soil after harvest, was higher than
the expected balance. This may be attributed to release of fixed K in the soil
and release of K from compost. The actual S balance is lower than expected. S
released from the compost and the soil may have been sufficient to meet the
requirement of the crop.
Singh, D. et al.: Response of potato to nitrogen and
potassium application under Faizabad conditions. J. Indian Potato Assoc. 24:
40-43, 1997
In a field experiment with four levels of N and K respectively, increasing
levels of both nutrients showed a tangible impact on growth and tuber yield.
Maximum tuber yield of 45 and 37.3 t/ha was recorded with N at 240 kg/ha and
K2O at 180 kg/ha.
Dwivedi, R.S. et al.: Effect of potassium on
EDTA-osmoticum, nitrate reductase activity and productivity of
groundnut-sugarcane intercropping under water deficit conditions. In:
Proceedings of the 13th International Plant Nutrition Colloquium on
Plant nutrition for sustainable food production and environment (ed. T. Ando et
al.), 13-19 Sept. 1997, Tokyo, Japan, pp. 93-94, (Kluwer Academic Publ.,
Dordrecht, Boston, London)
K deficiency and drought led to a substantial decline in yield of sugarcane and
groundnut, whether grown as a single crop or intercropped. Drought also
resulted in decreasing contents of leaf K, organic acids and nitrate reductase
activity in the leaves. However addition of K, especially in drought
conditions, significantly raised all the parameters. Application of potash was
also found to be beneficial in restoring the sucrose content in cane and the
oil content in groundnut kernels, which were considerably reduced under drought
conditions.
Kuzmina, N.A.: Nitrogen, phosphorus and potassium
concentrations and their balance of durum wheat plants during different growth
stages. In: Proceedings of the 13th International Plant Nutrition
Colloquium on Plant nutrition for sustainable food production and environment
(ed. T. Ando et al.), 13-19 Sept. 1997, Tokyo, Japan, pp. 97-98, (Kluwer
Academic Publ., Dordrecht, Boston, London)
In order to establish diagnostic tools for fertilization of durum wheat on
black clay soils, the contents of N, P and K were determined during different
stages of plant development. There is only a weak relationship between soil N
and P and the productivity of plants. Weather conditions (soil moisture) are
important factors in the availability of these two nutrients. It is the balance
of mineral elements which determines the final yield. There is a close
relationship between N/P ratio and grain yield during all growth stages, and
between the K/P ratio and yield during the heading stage.
Brkic, I. et al.: Inheritance of potassium, calcium and
magnesium status in maize plants. In: Proceedings of the 13th
International Plant Nutrition Colloquium on Plant nutrition for sustainable
food production and environment (ed. T. Ando et al.), 13-19 Sept. 1997, Tokyo,
Japan, pp. 163-164, (Kluwer Academic Publ., Dordrecht, Boston, London)
Under conditions of adequate soil fertility there is a poor correlation between
the nutrient status of maize and yield. The ear-leaf nutrient status of hybrid
maize lines varied independently from yield and is obviously under significant
genetic influence. There is also a genetically induced negative correlation
between ear-leaf concentrations of K and Mg. It would be of interest to repeat
the investigations under stress conditions, for example on K-deficient soils.
Sacramento do, L.V.S. and Rosolem, C.A.: Efficiency of K
utilisation by soybean cultivars. In: Proceedings of the 13th
International Plant Nutrition Colloquium on Plant nutrition for sustainable
food production and environment (ed. T. Ando et al.), 13-19 Sept. 1997, Tokyo,
Japan, pp. 167-168, (Kluwer Academic Publ., Dordrecht, Boston, London)
The high K requirement of soybean, and the large extent of K-depleted soils in
Brazil, are the driving forces to select and introduce cultivars which are more
efficient in K utilisation. The cultivars tested in the experiment (solution
culture) differed under K-deficient conditions in potassium utilisation
efficiency. There are also genotypical differences in the cultivar plasticity
to adapt to K deficiency.
Katsuhara, M.: Molecular aspects of potassium and water
transport, their bearing under salt stress. In: Proceedings of the
13th International Plant Nutrition Colloquium on Plant nutrition for
sustainable food production and environment (ed. T. Ando et al.), 13-19 Sept.
1997, Tokyo, Japan, pp. 201-202, (Kluwer Academic Publ., Dordrecht, Boston,
London)
Drought and salt stress are major limiting factors for crop production in the
arid or semi-arid areas, which host about 25% of the world’s population.
Breeding for higher tolerance to salt and/or drought is thus mandatory. The
paper covers molecular breeding with respect to high affinity K uptake systems.
Kovacevic, V. et al.: Response of maize to soil stress
and to P and K fertilization on strong K-fixing soil. In: Proceedings of the
13th International Plant Nutrition Colloquium on Plant nutrition for
sustainable food production and environment (ed. T. Ando et al.), 13-19 Sept.
1997, Tokyo, Japan, pp. 315-316, (Kluwer Academic Publ., Dordrecht, Boston,
London)
On K-fixing gleysoils in Croatia, maize yields increased by 87% and 42% with
the highest level of K (2.1 t/ha) and P (1.1 t/ha) respectively.
Correspondingly, the ear-leaf K and P content increased from deficiency to an
adequate level. Improvement of the ear-leaf K decreased the Mg content. There
are also genotypical differences in the tolerance of maize hybrids to K and P
deficiency.
Gill, M.A. et al.: Potassium-deficiency stress tolerance
and potassium utilisation efficiency in wheat genotypes. In: Proceedings of the
13th International Plant Nutrition Colloquium on Plant nutrition for
sustainable food production and environment (ed. T. Ando et al.), 13-19 Sept.
1997, Tokyo, Japan, pp. 321-322, (Kluwer Academic Publ., Dordrecht, Boston,
London)
Growth response of 20 wheat genotypes was tested under deficient and adequate K
levels in solution culture. There are substantial genotypical differences in
several growth parameters, like shoot and root weight. It is concluded that
wheat genotypes tolerant to K deficiency can be identified for cultivation
under low K supply conditions.