The field experiment was carried out in the fields of a farmer in Kirkuk governorate / Hawija district N 43º36´17.73"E"05.56´ 35º16, and the study included the planting of the crop rotation crops (mung beans, sunflower and sesame and without planting) in the summer For the year 2020, and in the winter season, the wheat crop, Sham 6 variety, was planted in the experimental units planted with the crops of the agricultural rotation, as well as fallow land that was not planted with any previous crop. The wheat crop was treated with inducting factors (atonic, salicylic acid, hydrogen peroxide and organic copper) by two sprays, the first at the branching stage and the second at the end of the elongation stage, for each of the inducting factors, the randomized complete block design was used in the arrangement of the split plot RCBD in split plot), the results of the experiment showed a significant superiority of the induction treatment with organic copper in reducing the infection indicators of wheat plants, as it recorded the percentage of infestation of spikes, the percentage of infected grains and the average weight The gall had the lowest average of 10.92 %, 3.42 %, and 3.91 mg, respectively, and the sunflower treatment showed a significant difference for the characteristics of the percentage of spikes infestation, the percentage of infected grains, and the average weight of the gall. Were 10.39, 4.30%, and 3.83 mg, respectively As for the interaction treatments between inducing factors and the crop rotation, the treatment of (Sunflower + Organic Copper) was superior when it recorded averages of 5.71%, 0.47% and 2.33 mg, respectively.

The results of the competitive indicators between cotton and soybean showed that the Land Equivalent Ratio (LER) for soybean crop (Lb) was greater than that of cotton (La) in the distance of 10 cm and for all IS’S as well as the planting distances of 15, 20 and 25 cm at the IS of 1 cotton: 2 soybean. While planting at a distance of 15, 20, and 25 cm, when IS (1: 1) and (1: 2) cotton: soybean, LER for cotton (La) was greater than for soybean (Lb). It also gave Crop Performance Ratio (CPR) for cotton higher than soybean when planting at a distance of 15, 20 and 25 cm in all IS’S, as well as when planting at a distance of 10 cm when IS’S were (1: 2) and (2: 2) cotton: soybeans. The values of Relative Crowding Coefficient (RCC) were higher for the soybean than for cotton under IS of 1 cotton: 2 soybean when planting at a distance of 10, 15, 20, and 25 cm, while the Land Equivalent Coefficient (LEC) values gave yield advantage in IS of 2 cotton: 2 soybeans, for all planted distances, and it ranged between, 0.25-0.33. The values of the Competition Ratio (CR) for cotton were higher than one in the IS of 2 cotton: 2 soybean at all planting distances. While the values of (CR) were greater than one for soybean at the IS of 1 cotton: 2 soybean and for all planting distances. The aggressivity (A) for cotton was positive in the IS of 2 cotton: 2 soybean and negative for the IS of 1 cotton: 2 soybean at all planting distances.

seven varieties of Barley was carried out wtich were (Brag , Shahah , Al-KHeer , Al-Wrkai , Sameer ,Al-Hadher and Amal) have been grown in seasonal 2014-2015 and 2015-2016 in the province of Kirkuk, using Randomized Complete Block Design with three replicates, included the characteristics of number of days for the expulsion of spikes 50% of plants ,plant height (cm) ,spike length (cm) , number of spikes / m 2 , number of grains spike , weight of a thousand grian(g) and grain yield (kg / ha) , notes that the product was Sameer may outweigh the number of spikes / m 2 on average for seasonal (355.5 spike / m 2) and yield grain (kg / ha) in the first season was (3463 kg / ha), but obtained fell in the second season and gave less obtained was (3022.3 kg / ha) , superiority Al-Kheer variety at a rate of (3600 kg / ha) , Amal variety was surpassed in the number of grain Spike and Shuaah in the weight of a thousand grains .This variation in the traits between varieties gives an indication of the possibility incorporated in education programs by hybridization in order to collect desired characteristics in the synthesis of certain hereditary, also notes that the genetic and phenotypic differences were a burden and moral in all attributes except the weight of a thousand grain an indication that the HLA dominant in inheriting and is reflected in the values of heritability in the broad sense as she was high except spike length in the first season, correlations and regression noted that the number of spikes and the number of grains spike and the weight of a thousand grain the most important qualities that have an impact on changes holds that occur on the grain barley crop and can be adopted as indicators of electoral improved .