[Effect of arable layer thickness on soil properties and spring barley yield]
2000
Arlauskas, M. (Lithuanian Inst. of Agriculture, Dotnuva (Lithuania))
Investigations of arable layer thickness were carried out at the Lithuanian Institute of Agriculture (Dotnuva) over the period 1975-1997. A long-term small-plot experiment was established by composing a 10, 20, 30 and 40 cm arable soil layer from fertile loamy textured soil, brought from a long-term grassland. The experiment was set up on two backgrounds, not fertilised and fertilised with N 90 P 90 K 90. Spring barley was grown after sugar beets. In both backgrounds we determined the components of barley yield, straw and grain, quality of grain and seed properties, as well as soil physical and chemical properties. The findings of the long-term experiment revealed that when new high yielding barley varieties were sown the yield significantly increased after the plough soil layer was increased down to 40 cm, and especially when the crop was sown in a poor soil, or in the soil which had not been fertilised for a long time. The optimal arable soil layer was revealed to be about 30 cm when high rates of fertilisers (N 90 P 90 K 90) had been used
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