Claim · model-written summary
Absorbed nitrogen at stage III decreased the main bulb yield.
- Taxon
- Dutch iris
Iris ×hollandicae0 - Material
- Wedg-Woode1
- Organ / stage
- stage IIIe3
- Treatment
- absorbed nitrogene2
- Outcome
- main bulb yielde3
- Direction
- decreasee3
- Setting
- sand culturee1
Not reportedComparator
Verbatim
e0“growth and the yield of Dutch iris”
e1“5.5±0.2g bulbs of cv.‘Wedg-Wood’in sand culture”
e2“The effects of absorbed nitrogen of each stages on the production of the bulbs were shown in Tables 5 and 6, i.e., stage I, non-effective or rather decrease the yield”
e3“stage III, decrease the main bulb yield, but tend to increase the lateral bulbs yield”
Title
Nitrogen nutritional studies with flower-bulb crops
Mikiyo YAMANE Journal of the Japanese Society for Horticultural Science 1970. doi:10.2503/jjshs.39.353
Other claims from this paper (19)
- Intervention effect Foliage fresh weight, dry weight and dry weight rate were highest in the nitrogen omission group at the end of March.
- Intervention effect Nitrogen supply or omission at stage III determined the foliage nitrogen level at the end of March, which was the maximum of the growth period.
- Intervention effect Nitrogen supply until the end of stage II gave the maximum root nitrogen level at the end of January.
- Intervention effect Root nitrogen level increased after stage II when nitrogen supply was withheld until stage II but given at later stages.
- Intervention effect Nitrogen omission at stages I and II decreased the nitrogen level in the mother bulb.
- Association Nitrogen level and mother bulb weight were negatively correlated at the end of January (r=-0.979).
- Observation Absorbed nitrogen content was little at stage II and particularly abundant at stage IV.
- Association Nitrogen absorption was synergistic with potassium absorption.
- Association The correlation coefficient of nitrogen concentration among foliage, roots and mother bulb varied with growth stage and was especially small between foliage and roots at the end of January.
- Intervention effect Absorbed nitrogen at stage I was non-effective or decreased the bulb yield.
- Intervention effect Absorbed nitrogen at stage II gave the greatest increase in bulb yield with an ideal quality.
- Intervention effect Absorbed nitrogen at stage III tended to increase the lateral bulb yield.
- Intervention effect Omitting nitrogen at stage IV, when nitrogen was applied at stage IV, gave the maximum yield.
- Intervention effect Absorbed nitrogen at stage IV decreased the main bulb yield.
- Intervention effect Absorbed nitrogen at stage IV tended to increase the lateral bulb yield.
- Association Moisture content sensitively increased with absorbed nitrogen at stage IV and had a close relation with bulb nitrogen concentration.
- Association The relation between foliage and bulb nitrogen concentration became higher after stage III.
- Recommendation Suitable nitrogen supply for ideal bulb production is supply at stages II and III with omission at stages I and IV.
- Recommendation Suitable nitrogen supply for ideal bulb production is supply at stages I, II and to mid-May of stage IV, with omission at stage III and after mid-May of stage IV.