EFFECT OF SEEDING RATE AND METHOD OF WEED CONTROL ON THE PRODUCTIVITY OF GIZA 2000, A PROMISING BARLEY LINE, UNDER NEW LANDS CONDITION

Two field experiments were conducted at Nubaria Ag­ricultural Research Station during two consecutive growing sea­sons; 1999/2000 and 2000/2001 to determine the optimum seeding rate and weed control package for the new promising line (Giza 2000) under new lands.Four seeding rates (30,40,50,and 60 kg seeds/fad.) and three weed control (1-unweeded control 2- hand weeding twice 3-herbicidal control by Sinai 10% followed by Grasp10%. The highest seeding rates 60 and 50 kg /lad. produced the highest values of grain yield/fad., number of spikes/m and the lowest number and fresh weight of weeds (Avena spp was the dom­inant grassy weed and Raphanus raphanistrum as a dominant broad leaf weed). On the other hand seeding rate at 30 kg seeds /fad. gave the highest values of number of spikes /plant, grain yield / plant ,biological yield /plant, number of kernels/spike, spike kernel weight, 1000kwt, and number and fresh weight of both weed spe­cies. Grain yield increased from 12.6 ard. /fad. with 30 kg seeds / fad. to 16.51 ard. /fad. with 60 kg seeds Had. This increased es­timated by 31.90 %. Controlling weeds by herbicidal treatments in­creased grain yield by about 40.3 and 13.6 % compared to unweeded and hand weeding, respectively. Number of weeds decreased from 77 plants under 30 kg. seeds/ fad. to 13 plants under 60 kg. seeds / fad. However, when application of the mentioned herbicidal treat­ment totaley, vanquished the weeds, since zero number of weed plants was recorded after 90 days from sowing. The tratments of 40,50 and 60 kg seeds/fad with weed control and 60 kg seeds/fad. only (unweeded control) gave similar grain yield. The recommended package of the newly promising line (Giza 2000) sowing by 40 kg sends /fad. and treated by Sinai 10 % SC at 40 cc/fad. applied after 20 days from sowing and followed by Grasp 10 % EC at 1 L/fad. af­ter 21 days interval. The second recommended tretment was sow­ing by 60 kg seeds/fad. without weed control.