GENERAL AGRICULTURE AND PLANT BREEDING
PLANT BREEDING AND SEED PRODUCTION OF AGRICULTURAL CROPS
AGROCHEMISTRY
The problem to provide the livestock industry of the North-West of Russia with forage grain has sharply escalated since 2010. Its successful solution is connected with the level and validity of the use of mineral and organic fertilizers. The purpose of the study, started by the Menkovsky Branch of the AFI in 2012, was to find effective options for the use of new organic-mineral fertilizer (OMF) which provides maximum agronomic effect and can produce grain of high quality. The methodological basis was the micro trials in polyethylene vessels without bottoms of 1 × 1 × 0.4 m in size with an artificially formed upper part of the profile of degraded sandy sod-podzolic soil. The soil was of 4.75 рНKCl, 3.46 mmol (eq) of Ng per100g, 3.20 mmol (eq) of Sch per100g, 1.83% of humus, 217 mg / kg of mobile compounds of phosphorus and 92 mg / kg of potassium. In the course of research, there was high agronomic efficiency of its use for winter wheat and satisfactory agronomic efficiency of its use for barley. When the winter wheat variety ‘Moskovskaya 56’ was fertilized with 5 t/ha of organic-mineral fertilizer containing 2.46% of Ng, 4.51% of P₂O₅ and 3.36% of K₂O, grain yield increased in 2.6 times. Fertilized with N75P50K50 the productivity improved in 3.8 times with a payback of 1 kg of NPK 7.4 and 5.6 grain units, respectively. It has been established that the combination of OMF with mineral fertilizers is accompanied by a significant yield increase with a decrease in its relative contribution from 153% to 59% and from 143% to 105% and a payback of 1 kg of NPK from 3.8 to 2.6 and from 6.9 to 4.7 of barley grain units and winter wheat grain units, respectively. The best indicators of the agronomic efficiency of OMF, both when applied in pure form and when fertilized with N75P50K50, corresponded to a dose of 4 t / ha. It has been found that the addition of 10 kg of potassium (К₂О) per 1 ton to OMF provided yield increase on 15% and the payback period of 1 kg NPK increased from 6.4 to 8.4 grain units. Qualitative indicators of wheat and barley grain fertilized with OMF improved due to the rise of raw protein percentage on 8–27% and a number of ash elements, such as CaO (from 0.07 to 0.11 mg/kg), MgO (from 0.16 to 0.21 mg/kg), Zn (from 21.5 to 23.6 mg/kg).
The article presents the results of three-year studies conducted on the experimental field of the All-Russian Research Institute of Reclaimed Lands (VNIIMZ). The purpose of the research was to study the efficiency of various rates of fertilizer usage on winter triticale productivity. There has been studied the effect of rates of mineral fertilizer usage on the elements of the winter triticale yield structure, protein percentage in grain, use of photosynthetically active solar radiation (PAR efficiency), fertilizers’ cost recovery by yield increase. The cultivation of winter triticale was carried out on a drained well-cultivated sod-podzolic light loamy gleyed soil. The winter triticale was sown after one-year-old clover in three variants: the first variant was without fertilizer usage, the second variant was with N15Р15K45 + N30 fertilizer usage (in the period of tillering) and the third variant was with N30Р30K90+N60 fertilizer usage. In the variant without fertilizer usage the productivity was 3.37 t/ha on average. In the second variant the productivity increased on 56.4% to 5.27 t/ha, in the third variant the increase was on 78.9% to 6.03 t/ha. Due to the use of fertilizer, the number of productive stems raised on 95 and 117 pcs/m2, the number of kernels per head increased on 4.0 and 6.0 pcs. The protein content in grain in the variants with fertilizer usage increased on 1.0–1.7%. The PAR efficiency without fertilizer usage was the lowest (1.34), it was 1.94 with N45Р15K45 fertilizer usage and 2.26 with N90Р30K90 fertilizer usage. Fertilizers’ cost recovery by winter triticale yield increase which was sown after one-year-old clover in a well-cultivated soil, was the highest with 18.1 kg/kg of N45Р15K45 fertilizer usage and with 12.7 kg/kg of N90Р30K90 fertilizer usage.
ISSN 2079-8733 (Online)