Abstract
Yam (Dioscorea cayennensis Lam.) is a promising crop for small growers in the Northeast of Brazil, but productivities are limited due to low fertilization rates. Green manure could be an alternative due to its low cost and high availability. However, there is little information available regarding the effects of green manures on the productivity of yam. The quality and yield of yam tubers, “da costa” variety, were evaluated under application of three different green manures and a control treatment: 1) yam intercropped with sunn hemp (Crotalaria juncea L.); 2) yam intercropped with pigeon pea (Cajanus cajan L.); 3) yam intercropped with a combination of sunn hemp and pigeon pea; and 4) conventional yam crop system. The experiment was laid out in a randomized block design, with four repetitions. The data was submitted to analysis of variance and averages compared by Tukey´s test at 5%. Percentage values were transformed into arc sen (x/100)0.5. Sunn hemp and the combination of sunn hemp with pigeon pea produced the highest green manure biomasses (3.8 and 3.6 t DM ha-1, respectively) versus 2.1 t ha-1 with the use of only pigeon pea. However, the N concentration was higher in pigeon pea than in sunn hemp (26 and 16 g kg-1). Intercropping with pigeon pea led to the highest yield for total tubers (33.1 t ha-1), for market quality (32.2 t ha-1) and standard exportation quality tubers (23.0 t ha-1).
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Claims 7
Claim · model-written summary
Sunn hemp produced green manure biomass 3.8 and 3.6 t DM ha-1.
Verbatim
e0“Sunn hemp and the combination of sunn hemp with pigeon pea produced the highest green manure biomasses (3.8 and 3.6 t DM ha-1, respectively) versus 2.1 t ha-1 with the use of only pigeon pea.”
t0“yam tubers cultivated with green manure”
Claim · model-written summary
the combination of sunn hemp with pigeon pea produced green manure biomass 3.8 and 3.6 t DM ha-1.
Verbatim
e0“Sunn hemp and the combination of sunn hemp with pigeon pea produced the highest green manure biomasses (3.8 and 3.6 t DM ha-1, respectively) versus 2.1 t ha-1 with the use of only pigeon pea.”
t0“yam tubers cultivated with green manure”
Claim · model-written summary
only pigeon pea produced green manure biomass 2.1 t ha-1.
Verbatim
e0“Sunn hemp and the combination of sunn hemp with pigeon pea produced the highest green manure biomasses (3.8 and 3.6 t DM ha-1, respectively) versus 2.1 t ha-1 with the use of only pigeon pea.”
t0“yam tubers cultivated with green manure”
Claim · model-written summary
Pigeon pea had higher N concentration than sunn hemp.
Verbatim
e0“However, the N concentration was higher in pigeon pea than in sunn hemp (26 and 16 g kg-1).”
t0“yam tubers cultivated with green manure”
Claim · model-written summary
Pigeon pea intercropping gave the highest yield for total tubers at 33.1 t ha-1.
- Taxon
- yamt0
- Treatment
- Intercropping with pigeon peae0
- Outcome
- yield for total tuberse0
- Direction
- higheste0
- Value
- 33.1 t ha-1e0
Not reportedComparator
Verbatim
e0“Intercropping with pigeon pea led to the highest yield for total tubers (33.1 t ha-1), for market quality (32.2 t ha-1) and standard exportation quality tubers (23.0 t ha-1).”
t0“yam tubers cultivated with green manure”
Claim · model-written summary
Pigeon pea intercropping gave the highest market quality at 32.2 t ha-1.
- Taxon
- yamt0
- Treatment
- Intercropping with pigeon peae0
- Outcome
- market qualitye0
- Direction
- higheste0
- Value
- 32.2 t ha-1e0
Not reportedComparator
Verbatim
e0“Intercropping with pigeon pea led to the highest yield for total tubers (33.1 t ha-1), for market quality (32.2 t ha-1) and standard exportation quality tubers (23.0 t ha-1).”
t0“yam tubers cultivated with green manure”
Claim · model-written summary
Pigeon pea intercropping gave the highest standard exportation quality tubers at 23.0 t ha-1.
- Taxon
- yamt0
- Treatment
- Intercropping with pigeon peae0
- Outcome
- standard exportation quality tuberse0
- Direction
- higheste0
- Value
- 23.0 t ha-1e0
Not reportedComparator
Verbatim
e0“Intercropping with pigeon pea led to the highest yield for total tubers (33.1 t ha-1), for market quality (32.2 t ha-1) and standard exportation quality tubers (23.0 t ha-1).”
t0“yam tubers cultivated with green manure”
The same questions in other papers
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intercropping · yield · DioscoreaPositive and negative results
5 papers in the same direction as this paper · 1 in the opposite direction
- negative
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See all 7 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.