RESUMEN
To study the effect of rate and period spray of Propaneil herbicide on weed of rice such as [Echinochloa Crusgalli and E. colonum], a Field experiment was conducted at AL-Garma [Thi-Qar Governorate/Iraq] for two year [2000-2001] by using [R.C.B.D.] in split plot design with four replicates. The main - plots were included four rate of herbicide Propaneil [1.5, 2.5, 3.5, 4.5] Liter/donum, while sub-plots were included four treatment during three stages of weed growth, [2-3 leaves, 4-6 leaves and 6-8 leaves] and control. The results showed significant differences between rate and period of Propaneil herbicide. Also the results gave that all herbicide treatment were efficient in lowering the numbers of weeds compared to the untreated [control] treatment. The best combination was [2.5 liter/donum of herbiade x stage of weed growth 2-3 leaves] gave the highest yield of seed rice which was 928.5 and 915.6 ton/donum for 2000 and seasons. There was a significant effect for rate and period spray of Propaneil herbicide on growth, plant yield and its components
Asunto(s)
Herbicidas , Oryza/crecimiento & desarrolloRESUMEN
An experiment was caried out at agricultural research station/university of Basrah during season of 1996/1997 to study the effects of four levels of phosphorous fertilization [0, 80, 160 and 240 kgp2o5/ha] and three plant spacing [35x70,25x70 and 15x70cm] on some yield components of two Sunflower varieties. [Peredovick and Akmar]. Results shown hat head diameter, plant yield, number of seeds/head and weight of a thousand achene increased with increasing phosphorous fertilization levels up to 160 kgp2o5/ha, while head diameter and plant yield decreased at narrow spacing. The effect of interaction was significant on head diameter and plant yield. Variety Periodic gave higher yield then Akmar whereas, there was no significant differences between them in harvest index and 1000 achene weight