FEATURES OF FODDER CROPS PHOTOSYNTETIC ACTIVITY IN IRRIGATED CROP ROTATIONS
The article presents some indicators of photosynthetic activity and yield of silage crops in one-specific and mixed crops, as well as oats depending on predecessors. The greatest experience in the area of leaves formed a joint planting corn with peas and oats - 63,0 t/ha. A mixture of pea with oats amounted up to 41.5% of the total leaf area. Sowing a mixture of pea with oats between the rows of corn has led to a significant reduction in total net photosynthetic productivity of crops. Photosynthetic potentials maize, sunflower and sowing them through a series were on the same level. Overseeding pea mixture with oats between the rows of corn has led to a significant increase in photosynthetic potential. The highest yield of absolutely dry matter obtained from a single-mode sunflower crop (5,66 t /ha), the lowest - in corn (4.96 t / ha). Sowing through a series occupies an intermediate position (5,29 t / ha).Collecting fodder units shows the advantage of single-species sunflower crop (4,61 t / ha) over the other options experience. Overseeding peas and oats mixture allowed to significantly increase the collection of fodder protein per 1 hectare. There was a trend to an increase in oats leaf area after corn with peas and oats. There were no significant differences in grain yield in different predecessors. In silage crops correlation between leaf surface area and an absolutely dry substance average reverse - r = -0.346, between leaf surface area and feed with protein units weak direct - r = 0.218. In the area, net photosynthetic productivity and yield of absolutely dry matter oats are, respectively, the strengths and the average correlations - r = 0.725 and r = -0.218. In the area of leaf area, net photosynthetic productivity and yield of absolutely dry matter oats are, respectively, the strengths and the average correlations - r = 0.725 and r = -0.495.