Effect of humus preparations on chlorophyl content in leave and potato plant productivity on sandy soil in Moscow distric

Results on evaluation of ‘effect of organic preparations LFSC-HA (Life Force Soil Conditioner Natural Humic Acids for soil fertility) and LFSC-HB (Life Force Soil Conditioner Humate Balance for soil enrichment) on productivity of potato plant of early maturing variety ‘arizina’. Two preparations have been provided by firm ‘Life Force Ltd (Moscow). A field experiment was carried out on a potato plantation of the firm ‘Agriko-Eurasia’ in Moscow district on sandy soil with low humus content. Organic preparations were applied in to soil by hand in powder form in 50 g/sq. m dosage. Reaction of potato plants on the experimental treatment was assessed by measurement of chlorophyll a and b content in potato leaves, and number and mass of tubes per plant at harvest. Positive effect of preparation used on chlorophyll content in leaves and number of tubes peer plant was found. Prevailing number of tubes of small sizes (less than 30 mm) - 38% may be considered as negative effect for early maturing variety. Number of tubes greater than 50 mm may be assigned to stimulative effect of organic preparation LFSC-HA on tube formation may and to additional amount of phosphorus and potassium containing in the preparation as well. Additional evaluation of organic preparation produced by Life Force Ltd are needed to separate positive effects of organic substances and additional amount of mineral elements in it. Having in mind positive effect tested preparations on formation of bigger number of tubes there it is advisable to carry out experiments with late maturing varieties.