Egypt• J. Appl• Sci, 7 (4) 1992 255-273
GROWTH AND MINERALS COMPOSITION OF COFFEA ARABICA SEEDLINGS IN RESPONSE TO DIFFERENT LEVELS OF NITROGEN, PHOSPHORUS, POTASSIUM AND ZINC SOIL APPLICATION.
By
Asfotir. A.M.. EI- Gindi. F. M. A.A.R.Atiwia and A.N.EI-Ariki.
Depart.of Hort.* Fac.of Agric., Moshlohor. Zagazig University.
ABSRACT
Greenhouse experiment on one-year-old potted seedlings of coffea arabica grown on a medium consisting of a mixture of clay and sand at the rate of 1 : 1 was conducted to study the effect of two levels of N, P, K and Zn soil application on growth and plant minerals content. The obtained results revealed that :
(1) Soil application with ammonium sulfate, superphosphate and potassium sulfate at rate of 2.0 g or 4.0 g actual nutrient / plant resulted in increasing the number of leaves per plant, stem length, root length and dry weights of the different plant organs i. a., leaves, stem, root and total plant as well as top / root ratio as compared with the control. However, ZnS04 soil applications either at the rate of 0.5 g or 1.0 g per plant were the most premising in this concern.
(2) Ammonium sulfate soil application increased significantly leaf Nf Fe and Mn contents and decreased P, K, Ca, Mg and Zn contents• Meanwhile, increasing H rates depressed levels of most aforesaid elements.
(3) phosphorus fertilization increased P, Ca, Mg, Fe, Mn and Zn contents, while both M and 1C nutrients were decreased• Raising up the level of P2O5 applied in most cases increased F, K, Fe, Mn and Zn contents while N, Ca and Mg were- not affected.
(4) Significant increase in leaf N, P, K, Fe and Mn contents of the seedlings received potassium sulfate. However, the opposite was found with Ca content, but both Mg and Zn nutrients did not respond. Meanwhile, Indreasing K2O from (2.0 g to 4.0 g per seedling) increased significantly leaf P, K, Fe and Mn contents while N, Ca, Mg and Zn showed no definite trend for leaves of coffea arabica seedlings.
(5) ZnS04 soil application increased P and Zn contents, while N, Ca and Mn contents showed a significant decrease. Anyhow, leaf K, Mg and Fe contents were not affected.
|
