Tag Archives: balance

60-67 M. Hautala
Measurement and Modelling of Circumstances in Animal Houses: What, Why and How
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Measurement and Modelling of Circumstances in Animal Houses: What, Why and How

M. Hautala

Department of Agricultural Sciences, University of Helsinki, Finland
e-mail: mikko.hautala@helsinki.fi

Abstract:

The indoor air of the animal house has to be of such quality that the animal, the human being and the building should feel well. It means suitable temperature without moisture and gas, microbe and dust contents which should be low enough. The objective of our studies is to create general physical-chemical models for the ventilation and temperature of animal houses as the function of factors which affect micro climate (temperature, moisture, gases, dust, microbes, mould) and the heat balance of the animals. The optimal climate given by the models is achieved by the right ventilation. A system which is automatic or gives alarms and can be used to carry out the optimum conditions of the animal buildings in as stable a way as possible is needed. For this purpose reasonable and reliable sensors which measure the right factors are needed. So the results of sensors can be used for model based control of the ventilation in which case one can switch to the modelling adjustment in which more quantities can be simultaneously used and in such a way the quality of the indoor air of animal houses can be improved by the adjustment of only one quantity (temperature or moisture or carbon dioxide or other gas).

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183-190 E. Bakšienė, A. Ražukas and T.L. Nedzinskienė
Effects of organic farming and crop rotations on crop productivity and nutrient amount in the soil
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Effects of organic farming and crop rotations on crop productivity and nutrient amount in the soil

E. Bakšienė, A. Ražukas and T.L. Nedzinskienė

Voke Branch of the Lithuanian Institute of Agriculture, Žalioji aikštė 2, Trakų Vokė,LT-02232 Vilnius Lithuania; e-mail: eugenija.baksiene@voke.lzi.lt

Abstract:

The trials were carried out at the Voke Branch of the Lithuanian Institute of Agriculture during the period 2003–2007 and were designed to investigate the influence of organic (without fertilizers) and sustainable farming systems on plants (the plants were fertilized only with bonemeal as a source of phosphorus and magnesia of potassium as a source of potassium) and to explore their productivity, chemical properties of soil and balance of nutrients in the soil.The experiments were conducted in the trial field with 4 treatments, in various croprotations with the plants grown for green manure for the soil supply with nitrogen (the main nutritional element of sandy loam soil) without mineral fertilizers.The experimental results show that higher productivity was achieved when cultivatingplants after green manure of lupines and white mustard. We established negative nitrogen, phosphorus (except in the sustainable farming system) and potassium balance in the soil. The use of various crop rotations in all farming systems on sandy loam Haplic Luvisol showed that there was no definite effect on soil acidity but an increase in the total nitrogen and organic carbon content in the soil was observed. The amount of phosphorus increased and potassium decreased only in the organic farming system. Phosphorus and potassium amounts in the soil increased in the sustainable farming system.

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