the Symposium on Wheats for More Tropical Environments - cimmyt

53Table 3. Average yield of best wheat lines, P~rtoviejo, Ecuador, 1974 to 1978Yield (kg/ha)Lines/varieties 1974 1975 191E)!.1 1971!./ 1918~/OCEPAR 73008NP-824Bluebird-Gallo x Carpintero"S"/PAV''S''AlondraChenab 70NP-832RumiiiahieSonora 64!./ Sclerotium rolfsii damageQ./ Different testing site in same region4200394026403980 1020 3153900 980 26037503750385035601000820740620740320180200315310Table 4. Average grain yield for Sonora 64 under different dosages ofnitrogen and phosphorus, Portoviejo, Ecuador, 1973 to 1975Nitrogen Yield Phosphorus Yield(kg/ha) (kg/ha) (kg/ha) (kg/ha)o 2640 0 264020 2770 20 307040 2880 4o!./ 311060 2950 60 29208o!./ 3080 80 2970100 3110 100 3020120 3110 120 3105160 2900 160 2790!./ Economic dosage44104100420041204120380039002900Table 5. A comparison of herbicide application and yield, Portoviejo Experiment Station,Ecuador, 1975 to 1977HerbicideDosage (kg a.iJha)1915 1976 977Yield (kg/ha)Application time 1975 1976 1977!./Fluorodifen 3.0Fluorodifen + Linuron 1.5 +0.5Fluorodifen +Diuron 1.5 +0.52,4-0 (a) 0.75CheekQ./4.0 3.01.5 +0.5 2.0 +0.42.0 +0.40.50Pre-emergencePre-emergencePre-emergencePost-emergenee(tillering)2940281519001750520870 2603844 2651801700430 220!./ Severe Sclerotium rolfsii damageQ/ No herbicide application