Comparative productivity of cultivated crops on chernozem lands of the Orenburg south Preduralye

This article presents the results of the yields of maize and sorghum for silage over 24 years of research (1990-2013) crop rotations and permanent crops. The aim of our work is aimed at improving the productivity of maize and sorghum for silage and selection of the best predecessors shestiballny of rotation. Research objectives: 1. To set the value of the yield of maize and sorghum for silage depending on the effect and aftereffect of various predecessors and background power; 2. To Identify the causes of yield reduction of maize and sorghum for silage under permanent cultivation. Studies were conducted on two backgrounds power. On one half across the plots under the main tillage contributed N 40 P 40 kg of nutrient content per 1 ha, the second half of the plots studied without fertilizers. The size of the plots of the first order - 7.2 x 90 m, the second 3.6 x 90 m. Size fertilized background on the length of the plots of 30 m, podobrannogo - 60 m User area of 60 m 2 on plots fertilized and 120 m 2 on padobranom background. Agriculture the cultivation of corn and sorghum silage adopted for areas, the seeding rate is 0.05 and 0.07 million pieces of viable seeds per 1 ha. Sown varieties: ROSS - 144 МВ and Kinel.skaja - 3. Years of research covered all variety of weather conditions, and therefore, the data of meteorological conditions growing seasons of crops. Presents detailed information on the yield of maize and sorghum for silage depending on the precursor and the background power in the fourth rotation of the rotation. Given the yield of corn and sorghum silage in an average of four rotation crop rotation and permanent crops, depending on the precursors and the background power. Based on the above conclusions from which it follows that the main factor affecting the yield of corn and sorghum silage are weather conditions. Permanent their cultivation leads to lower yields.