Claim · model-written summary
There was no evidence that fungal diseases were involved in the herbage yield decrease at Rothamsted.
Verbatim
t0“Grass Swards”
e1“There was no evidence that fungal diseases were involved”
Title
Effect of Fungicides and Fertilizer on Yield and Diseases of Grass Swards
E. W. BROOM; A. J. HEARD; ELLIS GRIFFITHS; et al. Plant Pathology 1975. doi:10.1111/j.1365-3059.1975.tb01881.x
Other claims from this paper (15)
- Intervention effect Fungicides did not affect total annual dry matter yields at any of the three sites.
- Intervention effect Some fungicides slightly affected yield at some individual harvests.
- Observation Slight crown rust occurred on perennial ryegrass at Hurley in autumn 1972.
- Intervention effect Crown rust on perennial ryegrass was well controlled by oxycarboxin.
- Intervention effect Crown rust on perennial ryegrass was slightly controlled by benomyl.
- Intervention effect Yields of perennial ryegrass were not increased although crown rust was controlled by oxycarboxin and slightly by benomyl.
- Observation Drechslera spp. seemed slightly more common where the rust was controlled.
- Intervention effect At Hurley the ley yielded more with 400 kg N/ha than with 100 kg N/ha.
- Intervention effect The extra nitrogen fertilizer did not damage the sward at Hurley.
- Intervention effect The extra nitrogen fertilizer did not affect the amount of disease at Hurley.
- Intervention effect At Aberystwyth the leys were not damaged by 400 kg N/ha.
- Observation Yields at Aberystwyth were large.
- Intervention effect On old pasture at Rothamsted, extra NK fertilizer never increased the yield of herbage.
- Intervention effect On old pasture at Rothamsted, extra NK fertilizer once slightly decreased the yield of herbage.
- Mechanism The authors suggest the yield decrease may have been because patches of sward failed to regrow where more fertilizer was applied.