scholarly journals Farmyard manure and intra-row spacing on yield and yield components of Adama Red onion (Allium cepa L.) cultivar under irrigation in Gewane District, Afar Region, Ethiopia

2017 ◽  
Vol 9 (5) ◽  
pp. 40-48
Author(s):  
Asres Mekonnen Derajew ◽  
Gedamu Mihretu Fikreyohannes ◽  
Woldetsadik Kebede
Keyword(s):  
Allium Cepa ◽  
Yield Components ◽  
Farmyard Manure ◽  
Row Spacing ◽  
Afar Region ◽  
Allium Cepa L ◽  
Yield And Yield Components

Evaluation of genetic variability of six Iranian landraces of onion (Allium cepa L.) for seed yield and yield components

2011 ◽  
Vol 37 (5) ◽  
pp. 385-391
Author(s):  
Mahin Rafieipour ◽  
Alireza Motallebi-Azar ◽  
Nasser Mahna ◽  
Habib Davati Kazemnia ◽  
Samaneh Kazemiani ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Allium Cepa ◽  
Seed Yield ◽  
Yield Components ◽  
Allium Cepa L ◽  
Yield And Yield Components

scholarly journals Calibration and test of the cropgro-dry bean model for edaphoclimatic conditions in the savanas of Central Brazil

2002 ◽  
Vol 59 (4) ◽  
pp. 723-729 ◽  
Author(s):  
Elza Jacqueline Leite Meireles ◽  
Antonio Roberto Pereira ◽  
Paulo Cesar Sentelhas ◽  
Luis Fernando Stone ◽  
Francisco José Pfeilsticker Zimmermann
Keyword(s):  
Grain Yield ◽  
Yield Components ◽  
Simulation Models ◽  
Row Spacing ◽  
Dry Bean ◽  
Area Index ◽  
Central Brazil ◽  
Yield And Yield Components ◽  
Predicted Values ◽  
Bean Crop

Simulation models are important tools for the analysis of cultivated systems to estimate the performance of crops in different environments. The CROPGRO- model (DSSAT) was calibrated and validated using Carioca bean (Phaseolus vulgaris L.) to estimate yield and the development of the crop, sown in three row spacings (0.4, 0.5, and 0.6 m) and two fertilization rates (300 and 500 kg ha-1 of 4-30-16 N-P-K), in Santo Antônio de Goiás, GO, Brazil. To calibrate the model a combination of the genetic coefficients that characterize the phenology and morphology of the dry bean crop was used to obtain the best possible fit between predicted and observed anthesis and physiological maturity dates, leaf area index (LAI), total dry matter (TDM), yield components, and grain yield for the 0.6 m row spacing. To test the model the experimental records of the 0.4 and 0.5 m row spacings were used. In both, calibration and test, the performance of the model was evaluated plotting observed and predicted values of LAI and TDM versus time, using the r², and the agreement index (d) as statistical criteria. In relation to yield and yield components the percent difference between the observed and predicted data was calculated. The model appeared to be adequate to simulate phenology, grain yield and yield components for the Carioca bean cultivar, related to different levels of fertilization and row spacing, either during calibration or the testing phase. During the test, the grain yield was overestimated by less than 15.4%, indicating a potential use for the calibrated model in assessing climatic risks in this region.

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