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close this bookAbstracts on Sustainable Agriculture (GTZ; 1992; 423 pages)
Open this folder and view contentsAbstracts On Traditional Land-Use Systems
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Open this folder and view contentsAbstracts on integrated systems
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close this folderAbstracts on seed production
View the documentAcknowledgements
View the document1. Good quality bean seed.
View the document2. A pocket directory of trees and seeds in Kenya.
View the document3. Seed production of agricultural crops.
View the document4. Seed potato systems in the Philippines: a case study.
View the document5. Seed enrichment with trace elements.
View the document6. Current practices in the production of cassava planting material.
View the document7. Alternative approaches and perspectives in breeding for higher yields.
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5. Seed enrichment with trace elements.

In: Proc. of the 8th Int. IFOAM Conference, Budapest, Hungary, 1990, pp.131-133

Little or no attention is given to seed nutrition. It is considered that, automatically, seeds, produced by plant breeding, may give rise to healthy, vigorous plants. If this does not occur, soil is improved by heavy NPK application, and agro-toxics have to protect the high yielding crops attacked by pests and diseases.

The author worked with copper enrichment to paddy seeds and found that only plants of treated seed responded to a copper fertilization; seeds of plants fertilized with copper did not respond to enrichment. Paddy with copper gave higher yields, had a better grain quality, breaking on seldom when husked, and had a strong resistance to Pirucularia oryzae.

Even in fields infected with Piricularia oryzae and planted with infected seeds, no diseased plant appeared.

Seed treatment of maize and beans was very efficient. The soil roots of maize, given boron to seeds, are deeper. Spodoptera frugiperda attack was reduced to 2% instead of 55% on the test plots. Nearly all plants had two to three ears. Ears were greater and grains heavier. During storage of six months, no worm attacked. With zinc sulphate there was no attack of Elasmopalpus, which killed 20% of the seedlings on the testplot. Zinc additionally to the soil made the plants more drought resistant.

Seed enrichment to field beans protected them against parasites when followed by two leave applications, whilst the test plants had to be sprayed with pesticides five times. Those plants with seed enrichment and leave fertilization did not need to be protected.

It is assumed that plant protection against parasites by seed enrichment and trace element fertilization may be due to the nutritive effect.

Micronutrients are enzyme activators or part of the prosthetic group or incorporated in the enzyme itself. A stronger enzymatic activity may be assumed as facilitating the formation of organic substances improving the biological value of plants.

The seeds could be treated with a surprisingly high concentration of multi saline solution. It may be supposed that trace elements in balanced proportion with others, like iron-manganese or copper-molybdenum may be used in much higher concentrations without a toxic reaction. On the other hand, even potash is toxic in mono saline solution.

It may be concluded that well-nourished or enriched seeds are more resistant against parasites. Plant health may be improved by seed enrichment and micronutrient fertilization. At the same time this increases yield and biological quality. Crop production with enriched seeds is less expensive and risky than conventional agricultural technology.

1192 92 - 9/39

Seed production

Review, tropics, cassava, planting material, production methods, stakes, cutting methods, mukibat system, handling, chemical treatment, CIAT,

CIP, IITA,UNDP

LEIHNER, D.E.

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