Žemės ūkio mokslai / Agricultural Sciences
 ISSN 1392-0200 |
2003 m. Nr. 3 Influence of legume crops on the fertility of clay loam soil and winter wheat productivity
The effect of red clover
(Trifolium pratense L.), sown lucerne (Medicago sativa L.), vetch and oat
mixture (Vicia sativa L., Avena sativa L.) and green material of these legume
crops used as green manure on the build up of biological N variation of soil
properties and productivity of winter wheat (Triticum aestivum L.) was
investigated on Endocalcari-Endohy- pogleyic Cambisol (CMg-n-w-can), according
to the texture - clay loam on silty clay. Experiments were carried out at the
Joniškėlis Research Station of the Lithuanian Institute of Agriculture over the
period 1996- 2000. It was revealed that lucerne and clover left the highest
content ofplant residues in the soil (13.7 t
ha-1 and 9.2 t ha-1 of dry matter, respectively), which was 2.7 and 1.8 times
more as compared to annual vetch and oat mixture. These perennial plants also
determined accumulation of the highest content of biological N in roots and
residues. According to N content applied with green manure, only lucerne
aftermath was comparable to farmyard manure. Lucerne determined accumulation of
the highest contents of total nitrogen (0.138%), humus (2.18%) and available
phosphorus and potassium (130 and 279 mg kg-1 of soil, respectively) in the
soil. Analysis of humus composition showed that its content in clay loam soil
was rather stable, however, a slightly higher content of mobile humic acids was
found after lucerne as a preceding crop when green manure or farmyard manure
had been applied. When winter wheat was grown after lucerne as a preceding
crop, the highest grain yield (on average 5.58 t ha-1) was obtained, which was
by 18.5 and 28.3% higher than that after clover or vetch and oat mixture.
Protein content in winter wheat grain was to a greater extent determined by legume
crops rather than by organic manure.
Keywords: clay loam, green and farmyard manure, soil properties, winter wheat |
Numeriai:
2012 - T.19 Nr.1 2011 - T.18 Nr.1, Nr.2, Nr.3, Nr.4 2010 - T.17 Nr.1-2, Nr.3-4 2009 - T.16 Nr.1-2, Nr.3-4 2008 - T.15 Nr.1, Nr.2, Nr.3, Nr.4 2007 - T.14 Nr.1, Nr.2, Nr.3, Nr.4, Nr.Priedas 2006 Nr.1, Nr.1.Priedas, Nr.2, Nr.3, Nr.4 2005 Nr.1, Nr.2, Nr.3, Nr.4 2004 Nr.1, Nr.2, Nr.3, Nr.4 2003 Nr.1, Nr.2, Nr.3, Nr.4 2002 Nr.1, Nr.2, Nr.3, Nr.4 2001 Nr.1, Nr.2, Nr.3, Nr.4 |