INFLUENCE OF FERTILISATION AND CLIMATE ON YIELD EVOLUTION OF TEMPORARY GRASSLAND FROM WESTERN ROMANIA (CASE STUDY) PUBLISHED

Veronica Sărăţeanu, Alexandru Moisuc, Doru George Laieş, Otilia Cotuna, Carmen Durău
Seeded grasslands are used to perform a competitive farming. They are placed in arable or are replacing grasslands powerfully degraded. The meaning of temporary grassland is to provide high and qualitative forage yields with the proper imputs, to prevent the increase of the costs of forage obtained. In this way is important to balance the fertilisers amounts applied to prevent their leaching through the soil. The purpose of this work is to show how the fertilisation and climate has influenced the fresh fodder yield obtained during the research period.Material studied in this work is represented by two temporary grasslands from Grădinari (175 ha) and Ticvaniu Mare (230 ha) (Caraş-Severin County, Romania). The temporary grasslands analysed in this work were seeded at the end of August 2003. The data were collected from 2004 to 2008. Researches were developed in Grădinari and Tigvaniu Mare localities (Caraş-Severin County, Romania). The former crop was a mixture of spring oat and pea harvested for fresh fodder. The mixture seeded comprises 6 grasses (Poa pratensis – 15%; Festuca pratensis – 10%; F. rubra – 10%; Dactylis glomerata -15%; Phleum pratense – 10%; Lolium perenne – 15%) and 2 legumes (Trifolium repens – 15%; Medicago sativa – 10%). The climatic data were registered at Meteorological Station Oraviţa placed at 16 km from Tigvaniu Mare and 12 km from Grădinari. The climatic parameters analysed in this work are annual averages of: air temperature, soil surface temperature, and rainfall amount and air humidity. Forage samples were weighted directly in field and then was calculated the average yield per hectare. The statistical analysis used is linear regression and correlation coefficient (r). The evolution of the floristic composition of sward was analysed using Braun-Blanquet (1964) method. The influence of climate and nitrogen fertilisation is different from a year to other being mostly influenced by the amount of rainfall and air humidity registered in the area, this aspect being reflected on the fresh fodder yield.
temporary grassland; yield; mixture; fertilization; climate
Presentation: oral

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