Mineral content and yield of rocket due to application of soil conditioners and biostimulants

Biostimulatori i poboljšivači tla omogućuju povoljnije uvjete u tlu za rast i razvoj biljke te u novije vrijeme imaju sve značajniju ulogu u proizvodnji povrća. Biljke tretirane biostimulatorima ostvaruju veću otpornost na stres uzrokovan nepovoljnim abiotskim i biotskim čimbenicima. Poboljšivači tla su tvari s osnovnom namjenom poboljšavanja kemijskih, fizikalnih i bioloških svojstava tla. Zbog sve veće ponude biostimulatora i poboljšivača tla na tržištu, potrebno je istražiti njihov utjecaj na morfološka svojstva, prinos i hranidbenu vrijednost različitih povrtnih vrsta. Stoga je, tijekom proljetnog roka 2016. godine u Zagrebu (Žitnjak) provedeno istraživanje čiji je cilj bio utvrditi utjecaj biostimulatora 'Bio- algeen S92' i poboljšivača tla 'Azomite' te njihove kombinacije na mineralni sastav i prinos rige (Eruca sativa Mill.) u usporedbi s kontrolnom varijantom. Riga je uzgajana iz presadnica na polietilenskoj foliji u negrijanom zaštićenom prostoru. Mjerena su morfološka svojstva nadzemnog dijela biljke (masa, visina, broj listova) i masa listova po sadnom mjestu te je određen prinos. U prvoj berbi, provedenoj 40 dana nakon sadnje, provedena je i analiza mineralnog sastava listova rige. Najveći prinos u prvoj i drugoj berbi, kao i ukupni prinos rige (3,96 kg/m2), utvrđen je kod biljaka tretiranih kombinacijom preparata 'Azomite' + 'Bio- algeen S92'. Između testiranih tretmana utvrđene su statistički opravdane razlike u količini svih minerala, osim fosfora. Opravdano najveća količina željeza, cinka i mangana zabilježena je kod tretmana 'Azomite' + 'Bio-algeen S92'. Na temelju ostvarenih rezultata, u uzgoju rige može se preporučiti primjena kombinacije preparata 'Azomite' i 'Bio-algeen S92' zbog pozitivnog utjecaja na morfološka svojstva i mineralni sastav listova.Biostimulants and soil conditioners provide improved soil conditions for growth and development of plants and also play a significant role in modern vegetables production. Plants treated with biostimulants achieve higher resistance to unfavourable abiotic and biotic stresses. Soil conditioners are substances with main purpose of improving the chemical, physical and biological characteristics of the soil. Due to the increasing availability of biostimulants and soil conditioners in the market, it is necessary to research their influence on morphological traits, yield and nutritional value of different vegetable species. Therefore, during the spring-summer growing period of 2016 research was conducted on a family farm in Zagreb (Žitnjak). The aim of the research was to determine the effect of biostimulant 'Bio- algeen S92', soil conditioner 'Azomite' and their combinations on the mineral content and yield of rocket (Eruca sativa Mill.) compared to the control. Rocket was grown from seedlings on polyethylene mulch in an unheated greenhouse. The morphological properties (mass, height, number of leaves), leaf mass per planting place and yield were determined. Mineral content of rocket was analysed after first harvest (40 days after planting). The highest yield in the first and second harvest, as well as the total yield of the rocket (3.96 kg m-2), was determined in rocket treated with the combination of 'Azomite' and 'Bio-algeen S92'. Among the tested treatments, statistically justified differences in the amount of all minerals except for phosphorus were determined. The highest amount of iron, zinc, and manganese was recorded by the application of 'Azomite' + 'Bio-algeen S92'. On the basis of the obtained results, the combination of 'Azomite' and 'Bio-algeen S92' can be recommended for growing rocket due to a positive influence on morphological properties and mineral content of leaves