RESEARCH CONCERNING GREENHOUSE TOMATOES GROWN ON ORGANIC SUBSTRATUM IN ROMANIA

In Romania, soilless culture methods for greenhouse vegetables are still in experimental stage. The research of vegetable growing department, team from USAMV Cluj-Napoca, folowed tomatoes culture on polyethylene peat bags, supplied with solid nutrients and nutritive solutions. The best results were obtained when a mixture of peat 80%+long duration follow soil and well-decomposed manure 20% was used and a volume of at least 8 l substrat/plant was ensured

Preliminary quality results regarding S.V.-18402 interspecific hybrid berries processed by multiple techniques to obtain a novel food product

In this study, SV 18402 interspecific hybrid (PIWI group grapevines) was subjected to processing by syruping the berries before boiling. The variants were: V1.1. - grape product from berries without skin – filtered; V1.2. - grape product from berries without skin – unfiltered; V2.1. - grape product from berries with skin– filtered; V2.2. - grape product from berries with skin – unfiltered. Before processing, raw material was assessed for total soluble solids (186 g/l sugar), pH (3.25), and acidity (7.35 g/l tartric acid). The variants of products measure soluble dry substance over 67% the minimum amount stipulated by the international standard, which guarantees the conservability of the product. Regarding sensory comparison, products from the whole berries (skin, pulp, and seeds) proved to be more acceptable by the general public, as compared to the other variants

Note on a Schurer-Stancu-type operator

The aim of this paper is to introduce a class of operators of Schurer-Stancu-type with the property that the test functions e0 and e1 are reproduced. Also, in our approach, a theorem of error approximation and a Voronovskaja-type theorem for this operators are obtained. Finally, we study the convergence of the iterates for our new class of operators.</jats:p

THE EFFECT OF MINIMUM STRIP-TILLAGE COVER CROP SYSTEM ON QUALITY SOIL INDICATORS IN VEGETABLE CROPS

This study compares a few agro-physical and chemical soil features submitted to influences of minimum strip-tillage cover crop system and conventional tillage system in cabbage, carrot, garden bean and sweet corn crops. From 2005 to 2008 comparative tests have been performed by the two tillage systems in Apahida (Cluj-Napoca), situated in an area of temperate continental climate (average annual temperature of 8 to 10°C, average annual rainfall of 590 mm; the soil is alluvial, sandy-clay, slightly plastic, moderately developed, mildly alkaline pH = 7.7, humus content of 3.4% and good potassium, phosphorous and nitrogen content). Soil reaction values and the high organic matter and nitrogen content have been measured before the experiment. Not too deep changes were recorded in the chemical soil reaction (pH), being still mildly alkaline. After three years of tests, in 2007 a 7.15 pH was recorded with conventional tillage and a 7.24 pH with minimum tillage. Total nitrogen content was medium in both crop variants (0.198% total N with conventional tillage and 0.192% total N with minimum tillage). P mobile content in the soil was also good: 125 ppm P with conventional tillage and 136 ppm P with minimum tillage. K mobile soil supply was high to very high – 210 ppm K mobile with conventional tillage, 232 ppm K mobile with minimum tillage. The humus level in the soil recorded a significant increase. At the beginning of the tests as of 2005, the humus in soil was of 3.40%; after two years of experimenting a 3.90% increase was recorded; after three years of testing the humus content was of 4.5% with the minimum strip-tillage cover system. The soil texture is medium, with a high degree of plasticity and adherence, water and air permeability, with a good water and nutrient retention. Following analyses soil structure modification was recorded, rates increasing from 78% to 83% with the minimum strip-tillage cover crop system, being noted that the higher the soil structuring level, the more increased the fertility