تأثير مواعيد الحش و مستويات من النتروجين في نمو و حاصل العلف الأخضر و الحبوب لمحصول الشعير Hordeum vulgare L.

الملخص EN

A field experiment was conducted during the winter season 2014 – 2015 in one of the field of Abo Gharak region 10 km west the center of Babylon government , Used randomized complete block design with system of Split plot with three replication, the nitrogen levels (without fertilizer , 50 , 100 , 150 , 200 , 250) kg N.ha-1, represented the main plots, while the cutting dates (without cutting , cut after 45 day from sowing , cut after 65 day from sowing , cut after 85 day from sowing) represented sub – plots .

Data was analyzed and tested by least significant difference (LSD).

The results showed :Superiority of the third cutting date C3 (cut after 85 day from sowing) significantly by giving higher means for the yield of green forage and yield of dry matter of 31.639 ton.ha-1 and 6.921 ton.ha-1 respectively, Also, the treatment C0 (without cutting) was superiori significantly by giving the higher means of grain yield , number of spikes, number of grains per spike, 1000 grain weight of 5.728 ton.ha-1 , 504.6 spike.m-2, 48.44 grain.

spike-1, 42.532 gm respectively.

Superiority of the nitrogen level N5 (250 kg N.ha-1) by giving the higher means for the yield of green forage , yield of dry matter , grain yield, number of spikes, number of grains per spike which reached 36.52 ton.ha-1 , 7.162 ton.ha-1 ,6.196 ton.

Ha-1 , , 505.9 spike.m-2 , 50.66 grain.spike-1 respectively.

The results showed significant effect for interaction values between study factors , the interaction of N5 × C3 gave higher mean for the yield of green forage, yield of dry matter reached, 42.647 ton.ha-1 , 8.960 ton.ha-1 respectively.

Also , the interaction of N5 × C0 gave higher mean for number of spikes , grain yield reached , 591 spike.m-2 , 7.607 ton.ha-1 respectively.

The results of study concluded that positive effect for late cutting dates in increasing the yield of green forage and yield of dry matter, it was faund also that non-cutting led to positive increasing in grain yield and most of its components, it was conclude that the high nitrogen levels led to positive increas in yield of green forage, yield of dry matter and grain yield as well .