Proceedings Volume 2010 (format .pdf) - SimpBTH

Mixed growing of wintering pea and triticum secale, as the differentplanting dates affect the agrochemical composition of the soil (Table 2). Comparedwith the control option in mixed crop pH remains constant (7.37 in KCl) or slightlyincreases (8.24 in H2O).The soils, where are harvested mixed crops are characterized by highcontent of mineral nitrogen, phosphorus and organic carbon in soil compared to thecontrol resulting from the activity of tuber bacteria. Later sowing periods arecharacterized by high nitrogen and carbon content of soil determined possibly bythe bigger quantity root and post-harvest residues in these terms. As regards theamount of phosphorus the opposite trend is established.Table 2. Agrochemical soil analysis – on average for the period 2006 – 2009P 2 0 5mg/100 gsoilMineral NpHVariantsmg/1000 g soillimited СH 2 O KCl NH 4 -N NO 3 -N сумаcontrol* 8.07 7.38 0.47 0.15 0.62 6.83 1.0025-30.09 8.09 7.36 10.22 5.04 15.26 12.28 1.0210-15.10 8.14 7.35 11.20 5.32 16.52 10.32 1.3325-30.10 8.50 7.40 11.48 5.60 17.08 6.00 1.10on average forthe three sowingperiod8.24 7.37 10.97 5.32 16.29 9.53 1.15* - the control is without fertilization, no plantsCONCLUSIONSThe period of sowing and sowing rate ratio in mixed growing of winteringpea and triticum secale influence the development of the root mass, tuberformationand the amount of post-harvest residues.The biggest weight of the root system (6.69 g) has the mixed seed sown inthe period 25-30 October, which corresponds to the maximum formation of postharvestresidues (1913.3 kg / ha). As regard the tuber-formation the optimumsowing is in the period 10-15 October (36.7 number of tubers / plant). Later sowingperiods are characterized by high nitrogen and carbon content of the soil,determined by the larger quantity post-harvest and root residues.Most favorable conditions for development of mixed agro-phitocenosis arecreated at a ratio legume: cereal 60:40 and 50:50 - 1070.1 respectively formed and885.1 kg / ha post-harvest residues. Increasing the legume component shareparticipation (70:30 and 80:20) in the sowing rate at the expense of cereals leads todecreasing the values of the above mentioned index by on average with 56.4 and40.3%. Notwithstanding the different ratio of cereal and legume component in thesowing rate, the grain component develops better than legumes. The quantity of101