Effetti delle lavorazioni del terreno sugli apparati radicali e la crescita di una coltura di mais: studio triennale e simulazione a lungo termine nel Bacino scolante nella laguna di Venezia

The work regards the effect of tree different land management techniques (conventional tillage, minimum tillage and no-tillage) on some biometric characteristics of a corn culture. This tree year work, done in a farm located in a draining basin of the Venetian lagoon, had the aim to individuate the influences of the different tools and of the different management techniques on the plant growth and if there could be some feedbacks on the production. The data have been collected during the first two years, while during the third one the surveys continued to have a global and precise view of the effects obtainable with the different techniques. The collected data, for what concerns the plant, regard some soil proprieties (bulk density, humidity) at different depths, biomass, foliar development and root growth. The surveys, when considered suitable, have been done all year round (2005/2006) and especially during tree specific phases, when the plant had 2-3 leafs on, at 7-8 leafs end during blooming so it was possible to compare different years. Even the emerging speed, the seed density and the different productions divided by working techniques were collected. At the same time all the data collected on the climate, on the soil and on the other cultural operations done were needed to calibrate the simulation model "Salus", that contains a special package on the different working techniques, and that permits to estimate the plant responses, the environmental impacts and the soil evolution at each climatic change. The results of the model, first of all used to calibrate the model itself, have been then used to evaluate the answers in a long term (15 years) of the tree different working techniques on the production, on the Carbon heap and on some soil characteristics.