Growth, yield and chemical composition of leaves of pear varieties on quince M A with different interstocks

U radu se iznose rezultati istraživanja rasta, rodnosti i kemijskog sastava lišća sorti krušaka: Trevuška, Viljamovka i Boskova bočica cijepljenih na podlozi dunje M A s međupodlogama: Gelert, Hardenpont i Dvostruka Filipova. Četverogodišnja istraživanja su provedena u pokusnom voćnjaku Poljoprivrednog instituta u Osijeku. Pokusni voćnjak podignut je po split-blok shemi. Do osme godine starosti istraživane sorte su postigle podjednako dobru vegetativnu razvijenost i rodnost. Pod utjecajem međupodloge nije utvrđena razlika u razvijenosti i rodnosti stabala. Lišće sorti: Trevuška, Viljamovka i Boskova Bočica na podlozi dunje M A s međupodlogama: Gelert, Hardenpont i Dvostruka Filipova bilo je dobro opskrbljeno dušikom, fosforom, kalijem, kalcijem i magnezijem. Pod utjecajem međupodloge nisu ustanovljene razlike u koncentraciji makrobiogenih elemenata u lišću istraživanih sorti. Koncentracija dušika, fosfora, kalija i kalcija varirala je ovisno sorti i godini. U petoj i šestoj godini starosti stabala signifikantno više dušika sadržavalo je lišće Viljamovke od ostale dvije sorte. Kroz sve četiri godine najmanje dušika sadrži lišće sorte Boskova bočica. U dvije uzastopne godine bila je koncentracija fosfora signifikantno veća u lišću Viljamovke nego Trevuške, a u jednoj godini i od Boskove bočice. Koncentracija kalija u lišću Boskove bočice bila je, u dvije godine, signifikantno veća nego u sorti Trevuška i Boskova bočica. U dvije godine lišće sorte Viljamovke sadržavalo je signifikantno više kalija od lišća sorti Trevuška i Boskova bočica. Lišće sorte Boskova bočica sadržavalo je dvije godine signifikantno više kalcija od lišća sorte Terevuška, a u jednoj godini i od lišća Viljamovke. Koncentracija magnezija bila je u sve četiri godine podjednaka u lišću istraživanih sorti.The paper presents the results of research on the growth, yield and chemical composition of the leaves of pear varieties: Precoce de Trevoux, Williams and Beurre Bosc on quince M A rootstock with interstocks: Beurre Hardy, Beurre d’Hardenpont and Double Philippe. Four-year research was conducted in the experimental orchard of the Agricultural Institute in Osijek. The experimental orchard was built according to the split-block scheme. By the age of eight years, the researched varieties achieved equally good vegetative development and yield. Under the influence of the interstock, no difference was found in the development and yield of the trees. The leaves of the varieties were well supplied with nitrogen, phosphorus, potassium, calcium and magnesium. Under the influence of the interstock, no differences were found in the concentration of macrobiogenic elements in the leaves of the researched varieties. The concentration of nitrogen, phosphorous, potassium and calcium varied depending on the variety and the year. In the fifth and sixth year of trees, the leaves of Williams contained significantly more nitrogen than the other two varieties. Throughout all four years, the leaves of the Beurre Bosc variety contain the least nitrogen. In two consecutive years, the concentration of phosphorus was significantly higher in the leaves of Williams than Precoce de Trevoux, and in one year even of Beurre Bosc. The concentration of potassium in the leaves of Beurre Bosc was, in two years, significantly higher than in the varieties Precoce de Trevoux and Williams. In two years, the leaves of the Williams variety contained significantly more potassium than the leaves of the Preccoc de Trevoux and Beurre Bosc varieties. The leaves of the Beurre Bosc variety contained significantly more calcium in two years than the leaves of the Precoce de Trevoux variety, and in one year also more than the leaves of Williams. The concentration of magnesium was the same in the leaves of the researched varieties in all four years