L. Koch

Research output: Thesisinternal PhD, WU


Cassava is indigenous in South America, from where it was introduced to all tropical countries of the old world. It was introduced to Java in 1810; the planted area there and on Madura in 1934 far surpassed that of any other country in the world. Seedling selection has achieved important results only in Indo-China and the Netherlands East Indies.
Many trials on flowering and fertilization were carried out and have shown how to obtain seed of good provenance, how to germinate them and how to establish plantations with them. Thus techniques of selection had improved gradually. The important nutritive qualities of the roots were described, while external

influences on several of them were traced. The choice of parents influenced the behaviour of the seedlings, but this did not imply that a certain quality was transmitted from the parents to their offspring or to many of them. Many correlations demonstrated that generally no genetic objections could be raised to combining of desired qualities.

Hybrids between cassava and Manihot glaziovii gave 30 generally fast growing plants, of which a part could be crossed mutually and with both parents. Some directives were given for the future. The desirability was stressed of importing many cassava varieties and Manihot spp. from South America, for large-scale selection of hybrids in the Netherlands East Indies.
Original languageDutch
QualificationDoctor of Philosophy
Awarding Institution
  • Wageningen University
  • van der Stok, J.E., Promotor, External person
Award date16 Feb 1934
Place of PublicationWageningen
Publication statusPublished - 1934
Externally publishedYes


  • manihot esculenta
  • cassava
  • cultivation
  • cultural methods
  • netherlands east indies

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