Abstract
Major limitations of bean ( Phaseolus vulgaris L.) production in arid and semiarid regions are lack of moisture and low soil fertility. An experiment was conducted to determine the effects of soil moisture and N : P : K (20 : 10 : 10) fertilizer on root and shoot growth of two cultivars of bean: cv. Carioca, an indeterminate Brazilian landrace, and cv. Prince, a determinate cultivar grown in Europe. Carioca appears generally stress‐tolerant while Prince is intolerant. Seedlings were grown in pots of non‐sterile soil at 30, 60 or 90 % field capacity (FC), and given 0, 0.1 or 1 g (kg soil) –1 of compound fertilizer. The soil contained a population of effective Rhizobium . Growth of both cultivars was greatest in the high moisture and high nutrient treatments. Root fractions were highest at low nutrient supply; the effect of water was not significant. Leaf fraction decreased as root fraction increased. Numbers of nodules were highest at high and intermediate moisture when no fertilizer was applied. Numbers were lowest at 30 % FC and at the highest fertilizer rate. Masses of nodules and fractions followed the same pattern. Decreasing water regime reduced the relative growth rate (RGR) of Prince, while Carioca maintained high RGR at unfavourable conditions of water and nutrients. Net assimilation rates (NAR) were unaffected by nutrient addition, and reduced by low moisture regime. Water use efficiencies (WUEs) were reduced by water stress but increased by nutrient deficiency. The water utilization for dry matter production was optimal at 60 % FC.
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Claims 14
Claim · model-written summary
Both cultivars grew most under high moisture and nutrient supply.
Not reportedComparator
Verbatim
e0“Growth of both cultivars was greatest in the high moisture and high nutrient treatments.”
t0“Bean”
Claim · model-written summary
Low nutrient supply produced the highest root fractions.
Not reportedComparator
Verbatim
e0“Root fractions were highest at low nutrient supply; the effect of water was not significant.”
t0“Bean”
Claim · model-written summary
Water regime did not significantly affect root fractions.
Not reportedComparator
Verbatim
e0“Root fractions were highest at low nutrient supply; the effect of water was not significant.”
t0“Bean”
Claim · model-written summary
Leaf fraction fell as root fraction rose.
Verbatim
e0“Leaf fraction decreased as root fraction increased.”
t0“Bean”
Claim · model-written summary
Nodule numbers peaked at high and intermediate moisture without fertilizer.
- Taxon
- beant0
- Treatment
- high and intermediate moisture when no fertilizer was appliede0
- Outcome
- Numbers of nodulese0
- Direction
- higheste0
RhizobiumNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Numbers of nodules were highest at high and intermediate moisture when no fertilizer was applied.”
t0“Bean”
t1“Rhizobium”
Claim · model-written summary
Nodule numbers were lowest at 30% field capacity and highest fertilizer rate.
Not reportedComparator
Verbatim
e0“Numbers were lowest at 30 % FC and at the highest fertilizer rate.”
t0“Bean”
Claim · model-written summary
Nodule masses and fractions followed the same moisture and fertilizer pattern.
Verbatim
e0“Masses of nodules and fractions followed the same pattern.”
t0“Bean”
Claim · model-written summary
Lower water supply reduced relative growth rate in Prince.
- Taxon
- beant0
- Material
- Princee0
- Treatment
- Decreasing water regimee0
- Outcome
- relative growth rate (RGR)e0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Decreasing water regime reduced the relative growth rate (RGR) of Prince”
t0“Bean”
Claim · model-written summary
Carioca maintained high relative growth under unfavorable water and nutrients.
Verbatim
e0“Carioca maintained high RGR at unfavourable conditions of water and nutrients.”
t0“Bean”
Claim · model-written summary
Nutrient addition did not affect net assimilation rates.
Not reportedComparator
Verbatim
e0“Net assimilation rates (NAR) were unaffected by nutrient addition, and reduced by low moisture regime.”
t0“Bean”
Claim · model-written summary
Low moisture reduced net assimilation rates.
Not reportedComparator
Verbatim
e0“Net assimilation rates (NAR) were unaffected by nutrient addition, and reduced by low moisture regime.”
t0“Bean”
Claim · model-written summary
Water stress reduced water use efficiency.
Not reportedComparator
Verbatim
e0“Water use efficiencies (WUEs) were reduced by water stress but increased by nutrient deficiency.”
t0“Bean”
Claim · model-written summary
Nutrient deficiency increased water use efficiency.
Not reportedComparator
Verbatim
e0“Water use efficiencies (WUEs) were reduced by water stress but increased by nutrient deficiency.”
t0“Bean”
Claim · model-written summary
Water utilization for dry matter production was optimal at 60% field capacity.
Verbatim
e0“The water utilization for dry matter production was optimal at 60 % FC.”
t0“Bean”
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