Abstract
ABSTRACT: The aim of this study was to identify soybean sowing dates on which there was low water surplus risk. The crop was raised on a Haplic Planosol soil in the Central Depression of Rio Grande do Sul, Brazil. Soybean development simulations and daily water balances were calculated for different sowing dates from August 1968 to July 2012. Water surplus data was subjected to BoxPlot analyses and Scott-Knott tests at a 5% error probability. Exponential, gamma, lognormal, normal and Weibull functions were tested and the best fits to the data were obtained for both subperiods and total cycle. The highest number of fits for the development cycle and subperiods were obtained using the gamma and weibull functions, respectively. For sowing carried out after November 1, there was a low water surplus risk in the sowing-emergence subperiod. The risk of water surplus during the development cycle decreased with the advance of the sowing date.
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Claims 4
Claim · model-written summary
Gamma functions produced the most fits for soybean development-cycle water-surplus data.
- Taxon
- soybean crop
Glycine maxt0 - Outcome
- fits for the development cyclee0
- Direction
- higheste0
- Comparator
- weibull functionse0
Not reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest number of fits for the development cycle and subperiods were obtained using the gamma and weibull functions, respectively”
t0“soybean crop”
Claim · model-written summary
Weibull functions produced the most fits for soybean development subperiods.
- Taxon
- soybean cropGlycine maxt0
- Outcome
- fits for the development cycle and subperiodse0
- Direction
- higheste0
- Comparator
- gammae0
Not reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest number of fits for the development cycle and subperiods were obtained using the gamma and weibull functions, respectively”
t0“soybean crop”
Claim · model-written summary
Soybean sowing after November 1 had low water-surplus risk during sowing to emergence.
- Taxon
- soybean cropGlycine maxt0
- Organ / stage
- sowing-emergence subperiode0
- Treatment
- sowing carried out after November 1e0
- Outcome
- water surplus riske0
- Direction
- lowe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For sowing carried out after November 1, there was a low water surplus risk in the sowing-emergence subperiod”
t0“soybean crop”
Claim · model-written summary
Simulated soybean water-surplus risk over the development cycle decreased with later sowing dates.
- Taxon
- soybean cropGlycine maxt0
- Organ / stage
- development cyclee0
- Treatment
- advance of the sowing datee0
- Outcome
- risk of water surpluse0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The risk of water surplus during the development cycle decreased with the advance of the sowing date”
t0“soybean crop”