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Forsøg med vanding af spindhør samt genanvendelse af rødningsvand

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Statens ForsØgsvirksomhed i Plantekultur Frøavls- og IndustriplantelorsØg (Asger Larsen)

1302, beretning

Forsøg med vanding af spindhør samt genanvendelse af rødningsvand

Experiments on irrigation ol libre Ilax and re-use ol retting water

Anton Nordestgaard

Resume

Ved statens forsøgsstationer gennemfØrtes i 1958-1967 ialt 38 forsØg med vanding af spindhør.

Uvandet blev på lermuldet jord ved Aarslev og Blangstedgaard sammenlignet med vanding ved 10, 20, 30 og 50 mm underskud og på sandjord ved Jyndevad og Lundgaard med vanding ved 10, 20 og 30 mm underskud, beregnet fra spindhØrrens fremspiring.

Resultaterne viser, at spindhørren var meget følsom overfor langvarig tØrke. TØrke under spind- hørrens længdevækst hæmmede den vegetative udvikling og dermed udbyttet af skættehØr, men påvirkede oftest frØudbyttet positivt. Vanding i denne periode havde således positiv effekt på ud- byttet af skættehør, men oftest negativ effekt på frØudbyttet. Vanding efter længdevækstens op- hør havde mindre betydning for udbyttet af skætte hø r, men derimod positiv effekt på frØudbyttet.

Gennemgående opnåedes det bedste resultat efter vanding ved et underskud på 20 mm og med en vandmængde på ca. 1 Y2 gange underskuddet.

Med genanvendelse af rødningsvand udførtes 6 forsØg i 1963-68. Genanvendelse af rØdnings- vandet gav et lidt dårligere rØdningsresultat end anvendelse af frisk vand.

Nøgleord: Vanding, spindhØr.

Summary

At the Government Research Stations 38 experiments were carried out during the years 1958-67 on irrigation of fibre flax. Not irrigated was on loamy soil at Aarslev and Blangstedgaard com- pared with irrigation at IO, 20, 30 and 50 mm deficit and on sandy soil at Jyndevad and Lund- gaard with irrigation at 10, 20 and 30 mm deficit, reckoned from the emergence of the fibre flax.

The findings show that fibre flax is very sensitive to a long term drought. Drought during the period of elongation restrained the vegetative development and with that the yield of scutching flax, but affected most often the seed yield in a positive way. So irrigation during this period af- fected the yield of scutching flax positively, but the seed yield negatively. Irrigation after ceasing of the stem elongation has les s importance for the yield of scutching flax but, however, a positive effect on the seed yield.

Generally the best result was obtained after irrigation at a deficit of 20 mm and with a water rate of approx. 1 ~ times the deficit.

On re-use of retting water six experiments were carried out in 1963-68. Re-use of the retting water gave a somewhat poorer result of the retting than application of fresh water.

Key-words: Irrigation, fibre flax.

Fuldstændig beretning kan fås ved henvendelse til Statens Planteavlskontor, Kongevejen 83, 2800 Lyngby. Tlf. (02) 85 50 57.

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