Abstract
The castor bean has attracted the attention of many farmers as an alternative crop for the National Program of Biofuel and its extensive use in the ricinochemical industry. The crop requires large planting areas to meet the demands of the fuel market. The aim of the present study was to evaluate the effects of irrigation water salinity and nitrogen fertilization on the growth and production of castor beans, ‘BRS Gabriela’, in a protected environment. The present study was conducted at the Center of Technology and Natural Resources of the Federal University of Campina Grande. The experimental design was completely randomized in a 5 × 4 factorial with three replications and one plant per plot. The treatments consisted of irrigation water with five electrical conductivity (ECw) levels of 0.7, 1.7, 2.7, 3.7, and 4.7 dS m-1 associated with four nitrogen levels of 60, 80, 100, and 120 mg of N kg-1 of soil. The interaction between water salinity and nitrogen rates did not exert significant effects on the variables studied. Increased salinity of irrigation water affected the growth in height and stem diameter of castor beans in all periods, and leaf area from 90 days after sowing. Increased nitrogen levels had a positive effect on leaf area at 60, 90, 120, and 150 days after sowing. The total mass of seeds, one hundred seed mass, yield, and number of fruits per plant decreased with the increase in water salinity, and the total mass of seeds was the most affected variable.
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Claims 7
Claim · model-written summary
Increased irrigation water salinity affected growth in height and stem diameter of castor beans in all periods.
- Taxon
- castor beans
Ricinus communise1 - Material
- BRS Gabrielae1
- Treatment
- Increased salinity of irrigation watere2
- Outcome
- growth in height and stem diametere2
- Setting
- protected environmente1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the growth and production of castor beans, ‘BRS Gabriela’, in a protected environment”
e2“Increased salinity of irrigation water affected the growth in height and stem diameter of castor beans in all periods, and leaf area from 90 days after sowing”
Claim · model-written summary
Increased irrigation water salinity affected leaf area of castor beans from 90 days after sowing.
- Taxon
- castor beansRicinus communise1
- Material
- BRS Gabrielae1
- Treatment
- Increased salinity of irrigation watere2
- Outcome
- leaf areae2
- Qualifier
- from 90 days after sowinge2
- Setting
- protected environmente1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the growth and production of castor beans, ‘BRS Gabriela’, in a protected environment”
e2“Increased salinity of irrigation water affected the growth in height and stem diameter of castor beans in all periods, and leaf area from 90 days after sowing”
Claim · model-written summary
Increased nitrogen levels increased leaf area of castor beans at 60, 90, 120 and 150 days after sowing.
- Taxon
- castor beansRicinus communise1
- Material
- BRS Gabrielae1
- Treatment
- Increased nitrogen levelse3
- Outcome
- leaf areae3
- Direction
- increaseinferrede3
- Qualifier
- at 60, 90, 120, and 150 days after sowinge3
- Setting
- protected environmente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the growth and production of castor beans, ‘BRS Gabriela’, in a protected environment”
e3“Increased nitrogen levels had a positive effect on leaf area at 60, 90, 120, and 150 days after sowing”
Claim · model-written summary
Increased water salinity decreased total seed mass, one hundred seed mass and yield of castor beans.
- Taxon
- castor beansRicinus communise1
- Material
- BRS Gabrielae1
- Treatment
- the increase in water salinitye4
- Outcome
- total mass of seeds, one hundred seed mass, yielde4
- Direction
- decreasede4
- Setting
- protected environmente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the growth and production of castor beans, ‘BRS Gabriela’, in a protected environment”
e4“The total mass of seeds, one hundred seed mass, yield, and number of fruits per plant decreased with the increase in water salinity, and the total mass of seeds was the most affected variable”
Claim · model-written summary
Increased water salinity decreased the number of fruits per plant of castor beans.
- Taxon
- castor beansRicinus communise1
- Material
- BRS Gabrielae1
- Treatment
- the increase in water salinitye4
- Outcome
- number of fruits per plante4
- Direction
- decreasede4
- Setting
- protected environmente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the growth and production of castor beans, ‘BRS Gabriela’, in a protected environment”
e4“The total mass of seeds, one hundred seed mass, yield, and number of fruits per plant decreased with the increase in water salinity, and the total mass of seeds was the most affected variable”
Claim · model-written summary
Total seed mass was the variable most affected by increased water salinity in castor beans.
- Taxon
- castor beansRicinus communise1
- Material
- BRS Gabrielae1
- Treatment
- the increase in water salinitye4
- Outcome
- total mass of seedse4
- Qualifier
- the most affected variablee4
- Setting
- protected environmente1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the growth and production of castor beans, ‘BRS Gabriela’, in a protected environment”
e4“The total mass of seeds, one hundred seed mass, yield, and number of fruits per plant decreased with the increase in water salinity, and the total mass of seeds was the most affected variable”
Claim · model-written summary
The interaction between water salinity and nitrogen rates had no significant effect on the variables studied in castor beans.
- Taxon
- castor beansRicinus communise1
- Treatment
- interaction between water salinity and nitrogen ratese5
- Outcome
- variables studiede5
- Direction
- no_changeinferrede5
- Setting
- protected environmente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the growth and production of castor beans, ‘BRS Gabriela’, in a protected environment”
e5“The interaction between water salinity and nitrogen rates did not exert significant effects on the variables studied”
The same questions in other papers
salinity · yield · Ricinus communis (castor bean)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
nitrogen · growth · Ricinus communis (castor bean)Positive and negative results
5 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
4 papers more in this group
See all 8 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.