Tillage - fertilization management practices to sustain integrity of soil properties and yields in a crop rotation / | Žemės dirbimo ir tręšimo įtaka dirvožemio savybių integralumo palaikymui bei augalų derlingumui sėjomainoje.
2006
Feizienė, Dalia, | Feiza, Virginijus, | Kadžienė, Gražina,
One two-factorial field experiment was carried out at the Lithuanian Institute of Agriculture during 2002-2005. It was set up on a loamy Endocalcari – Epihypogleyic Cambisol relatively rich in nutrients. The goal of the investigation was to study the changes in soil physical properties and crop yield as affected by different tillage and fertilization systems. Conventional tillage (CT), reduced tillage (RT) and no-tillage (NT) were investigated. It was revealed that application of reduced tillage led to an increase in penetration resistance in arable soil layer by on average 106 % and in a decrease in air-permeability by on average 29 %, compared to conventional tillage. The application of no-tillage led to an increase in bulk density and penetration resistance in arable layer by on average 10 and 195 %, respectively and in a decrease in air-permeability by on average 59 %, compared to conventional tillage. During the 4 experimental years soil mobile P content in 0-20 cm layer decreased by on average 27 % in CT, 22 % in RT and 24 % in NT systems. Renouncement of conventional tillage and application of RT or NT systems secured lesser losses of mobile K in 0-20 20 cm soil layer: decrease in K content in CT system was 20 %, in RT 18% and in NT 12 %. Application of high rates of mineral NPK fertilizers was significant only for the first crop (spring wheat) of the fourth-course crop rotation. Increasing of fertilization level for the other subsequent crops was not profitable. Reduction of tillage intensity caused a decrease in profitability. Average profitability in CT system was 29 %, in RT system 20 % and in NT system 6 %.
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