Library Catalogue

Library Catalogue

  • external user (warningwarning)
  • Log in as
  • About the Catalogue

    Union Catalogue of Agricultural Libraries in the Netherlands

    The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.

    Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.

    The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.

    As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".

    All titles are entered in their original language. Keywords are added to facilitate subject searching.

    The database is updated every day and now contains over 830.000 records.

Record number 104398
Title Potting media, transplants and yields in the production of glasshouse tomatoes
show extra info.
door L.S. Spithost
Author(s) Spithost, L.S.
Publisher Wageningen : Veenman
Publication year 1969
Description 36 p
Notes Proefschrift Wageningen
Ook verschenen als handelsuitgave
Tutors Wellensiek, Prof. Dr. Ir. S.J.
Graduation date 1969-03-14
Dissertation no. 443
Author abstract show abstract
Samples of potting composts for raising tomatoes on holdings in the South Holland glasshouse district were collected in 1960 and 1961.

In propagation experiments with soil blocks, fresh weight of young tomato plants were found to vary widely. Some 3/4 out of the investigated composts were not suitable for raising plants.

Soil analyses proved that under the given conditions many composts had an insufficient amount of plant available nitrogen, measured by means of N-value which is defined as mg water soluble N per 100 ml soil. Further investigations on composts for raising tomato plants in soil blocks showed that the relation between the optimal nitrogen dressing ( N d in mg N per l, or g N per m3) and N-value is given by:
N d = 10 [35 - N-value].

Plant growth in the growers' potting composts was also influenced by soil physical condition measured as the air filled pore content at pF = 1,0 or as the organic fraction>1000μin % of the total organic matter. The respective content should be at least 6 % or 30 %.

Experiments with series of transplants from different compost qualities showed that heavier plants made a better crop and produced a higher early and total yield. Overall stem height and fresh weight of the transplants were most accurate for predicting yields by means of regression equations, while the number of leaves at least 3 cm long and the stage of development of the first inflorescence were less accurate.

It is supposed that in the Netherlands the variation in yields of glasshouse tomatoes is partly due to poor potting composts for propagation; the decrease in potential during 1960-1965 is estimated at about 20 million guilders a year.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08200,443
FORUM ; STACKS ; NN08202,443
Keyword(s) (cab) cultural methods / solanum lycopersicum / tomatoes / soil taxonomy / soil classification / soil types / soil science / plant nutrition / fertilizers / manures / netherlands
Categories Vegetables
Publication type PhD thesis
Language English
There are no comments yet. You can post the first one!
Post a comment

To support researchers to publish their research Open Access, deals have been negotiated with various publishers. Depending on the deal, a discount is provided for the author on the Article Processing Charges that need to be paid by the author to publish an article Open Access. A discount of 100% means that (after approval) the author does not have to pay Article Processing Charges.

For the approval of an Open Access deal for an article, the corresponding author of this article must be affiliated with Wageningen University & Research.

Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.