The effect of blood hydrolysate on the yield and quality of hop

In Mutijovice stand, district Rakovnik, the efficacy of application of blood hydrolysate (commercial name Synergin) was studied during the years 1995 to 1997 in production hop-fields on yield and quality of strobils. The blood hydrolysate made from cattle blood contained free amino acids, peptidic grafts, calcic and amonium nitrate, and porfyrins. It was applied, diluted in 1500 to 2000 1 of water, by spraying in July in one term (half July, i.e. at the onset of anthesis) and in two terms (at the end of first decade of July and at the end of July). The dose of blood hydrolysate was gradated (1, 2, 3, 4, 6 l/ha). The results of the harvest in Tab. II confirmed a positive influence on yield of the strobils. The yield escalated in relation with increased dose from 1 to 6 ii ha (increment from 5.02 to 13.33%); the highest increment by split application was reached by the application of 3 l/ha (17.28%). The actual increment of the yield was influenced by the year and the weather - particularly in July and August (Tab. I). The highest efficacy was achieved during the year 1995 - the year with less favourable course of weather in second half of the growing season. According to Tab. III, the variant treated with blood hydrolysate achieved approximately the same content of alfa bitter acids in strobils as the control variant, The positive business evaluation of strobils in case of variants treated with hydrolysate was influenced mainly by better colour of strobils.