Claim · model-written summary
Yield declined with the duration of no-tillage cultivation under direct seeding on flooded paddy surface, following y = -58.6x + 525.0.
Oryza sativaVerbatim
t0“Ecological Variation of Rice and Weeds”
e1“Regression equations between yield (y) and duration of no-tillage cultivation (x) can be obtained as follows, y = -58.6x + 525.0 () for direct seeding on flooded paddy surface”
Title
Ecological Variation of Rice and Weeds in Direct Seeding on Flooded Paddy Surface of No-Tillage
Oh-Do Kwon; Yong In Kuk; Hae-Ryoung Shin Korean Journal of Weed Science 2002
Other claims from this paper (10)
- Association Weed species became fewer (simplified) as the duration of no-tillage cultivation increased.
- Association The most dominant weed changed from Aneilema keisak Hassk. to Leersia japonica Makino as the duration of no-tillage cultivation increased.
- Observation In tillage paddy fields, Echinochloa crus-galli was the most dominant weed.
- Observation Several weed species listed in the paper were the mainly occurring weeds in no-tillage paddy fields.
- Intervention effect The number of seedling stands in no-tillage paddy fields was 40-60 per, lower than in tillage paddy fields (79-92 per).
- Association Dissolved oxygen and water depth were factors influencing the number of seedling stands.
- Intervention effect Rice plants in no-tillage paddy fields had a lower number of panicles than those in tillage paddy fields.
- Intervention effect Ripening rate, 1,000 grain weight and number of spikelets per panicle were similar in no-tillage and tillage paddy fields.
- Intervention effect Rice in no-tillage paddy fields had about 24% lower yield than in tillage paddy fields after 2 years of no-tillage cultivation.
- Recommendation The critical year limit for no-tillage rice cultivation under direct seeding on flooded paddy surface was found to be 1 year.