Click for new scientific resources and news about Corona[COVID-19]

Paper Information

Title: 

EFFICIENCY OF EMPIRICAL COMPETITION MODELS FOR SIMULATION OF SUGAR BEET (BETA VULGARIS L.) YIELD AT INTERFERENCE WITH REDROOT PIGWEED (AMARANTHUS RETROFLEXUS L.)

Type: PAPER
Author(s): MIRSHEKARI BAHRAM,FARAHVASH FARHAD,HOSSEIN ZADEH MOGHBELI AMIR HOUSHANG
 
 
 
Name of Seminar: IRANIAN WEED SCIENCE CONGRESS
Type of Seminar:  CONGRESS
Sponsor:  ANKOMANE OLOME ALAFHAYE HARZE IRAN
Date:  2010Volume 3
 
 
Abstract: 

IN ORDER TO EVALUATE THE EFFICIENCY OF EMPIRICAL COMPETITION MODELS FOR SIMULATION OF SUGAR BEET (BETA VULGARIS L.) YIELD AT INTERFERENCE WITH REDROOT PIGWEED (AMARANTHUS RETROFLEXUS L.), A FACTORIAL EXPERIMENT BASED ON RANDOMIZED COMPLETE BLOCK DESIGN WITH THREE REPLICATIONS WAS CARRIED OUT. FACTORS WERE WEED DENSITIES (1, 4, 8, 12 AND 16 PLANTS M-1 OF ROW) AND RELATIVE TIME OF WEED EMERGENCE (EMERGED WITH SUGAR BEET; 10, 20 AND 30 DAYS AFTER SUGAR BEET EMERGENCE) INCLUDED WITH A WEED FREE CONTROL PLOT. YIELD DATA WERE ANALYZED BY FOUR NONLINEAR REGRESSION MODELS. RESULTS REVEALED THAT SUGAR BEET LAI REDUCED, WHEN WEED DENSITY INCREASED AND REDROOT PIGWEED (RP) EMERGED EARLIER, AND THE ROLE OF WEED DENSITY WAS MORE EFFECTIVE THAN TIME OF EMERGENCE FOR THIS CHARACTERISTIC. IN TREATMENTS WITH LOW SUGAR BEET LAI, RP LAI WAS MORE. FULL-SEASON INTERFERENCE OF 16 RP M-1 OF ROW DECREASED SUGAR BEET ROOT YIELD FROM 75 T HA-1 IN CONTROL TO 58 T HA-1. INCREASING OF EACH WEED PLANT, REDUCED SUGAR YIELD 1.3 AND 0.3 T HA-1 IN DENSITY INTERVALS OF 8-12 AND 12-16 PLANTS M-1, RESPECTIVELY. COUSENS MODEL HAD THE BEST SUGAR BEET YIELD SIMULATION BASED ON RP DENSITY AND RELATIVE EMERGENCE TIME BECAUSE OF HIGH R-SQUARE, LOW STANDARD ERROR AND LOW MEAN PERCENTAGE ERROR AND ROOT MEAN SQUARE ERROR VALUES. IN THIS MODEL, MEAN PERCENTAGE ERROR INCREASED FROM 1.4% TO 9.36% BASED ON ROOT YIELD AND SUGAR YIELD, RESPECTIVELY.

 
Keyword(s): MODEL, DENSITY, HYPERBOLIC EQUATIONS
 
 
Yearly Visit 40   tarjomyar
 
Latest on Blog
Enter SID Blog