Content of organic carbon and total nitrogen inStagnic Albeluvisols depending on fertilization     

Triin Teesalu MSc  Paul Kuldkepp  Avo Toomsoo  Tiina Laidvee 《Archives of Agronomy and Soil Science》2013,59(2):193-200

Abstract

The content of soil organic carbon (SOC) and total nitrogen (N_tot) was studied in a long-term field experiment with a three-field crop rotation (potato – spring wheat – spring barley) set up on arable sandy loam Stagnic Albeluvisol at Eerika, Tartu, Estonia. The studied factors were: (A) organic fertilizers with three treatments: (i) without organic fertilizer, (ii) farmyard manure (60 t ha^?1) used in every third year, and (iii) different organic (alternative) fertilizers (beet leaves + straw; pure beet leaves; slurry + straw; cereal straw) and (B) mineral nitrogen fertilizer with the rates: N-0; N-40; N-80; N-120 and N-160 kg ha^?1. The study years were 1993, 1996 and 1999. The average content of SOC (1.03%) was significantly influenced by the use of organic fertilizers. Only N_tot (mean value 0.110%) was influenced also by fertilization with mineral nitrogen. The C/N ratio (mean value 9.5) reflected changes in the content of SOC and N_tot  相似文献   

Effect of different management on biochemical properties of organic matter in Fragi-Stagnic Albeluvisols     

Lech Szajdak DSc  Paul Kuldkepp  Enn Leedu  Triin Teesalu  Avo Toomsoo  Raimo Kotildelli 《Archives of Agronomy and Soil Science》2013,59(2):127-137

Abstract

This study was conducted to measure the concentrations of N_total, N-NH₄ ⁺, N-NO₃ ^?, total organic carbon, dissolved organic carbon, and indole-3-acetic acid (IAA) and also activity of nitrate reductase as well as activity of urease from Fragi-Stagnic Albeluvisols' organic matter in a field experiment (crop rotation: potato – spring wheat – spring barley). Samples were obtained from long-term field studies at Eerika near Tartu, Estonia, and from the forest Tiksoja. The experimental plots were under different regimes of organic and mineral fertilizers. The concentrations of N_total, indole-3-acetic acid, activity of urease and C/N ratios were generally the highest in the forest soil Tiksoja. Application of organic and mineral fertilizers increased the activity of both enzymes as well as the concentrations of indole-3-acetic acid in soils. The various fertilizer regimes influenced biochemical factors in soils as well as crop yields. The increase of crop yields was associated with the activity of both enzymes and the content of indole-3-acetic acid in soils.  相似文献