A field experiment was performed in Southwest Germany to examine the effects of long-term reduced tillage (2000–2012). Tillage treatments were deep moldboard plow: DP, 25 cm; double-layer plow; DLP, 15 + 10 cm, shallow moldboard plow: SP, 15 cm and chisel plow: CP, 15 cm, each of them with or without preceding stubble tillage. The mean yields of a typical eight-year crop rotation were 22% lower...

abstract by increasing the world population and more need to supply food, farmers attend to use of chemical fertilizers, organic manures and pesticides. also, applications of these agents without attention to their side effects, cause more problems to human health and environment. nitrate is one of the most important elements of organic manures, which leach through soil to surface and ground wa...

plant performance and freshness is related to the pattern of its root growth development, which is highly affected by the water amount and water use management. therefore, the spatiotemporal variation of maize root under five treatments including full irrigation treatment (fi), partial root-zone drying treatments at two levels (receiving 75% of et =prd75, and 55% of et= prd55) and deficit irrig...

the objective of this work was to study the effects of tillage and liquid manure applications on some physical and chemical properties as well as on the carbon and nitrogen mineralization potential of a meadow soil. our results indicated that tillage and manure applications had no effect on the concentration of cu, mn, total n and organic c in 0-15 cm layer of soil after 15 years of treatment. ...

the aim of the present study is to assess the effect of pure and mixed plantations of eastern cottonwood (populus deltoides) and alder (alnus subcordata) on quantitative stand characteristics and soil properties. the experiment was established in 1994 using randomized block design with five treatments (1- p100%, 2- p67%-a33%, 3- p50%-a50%, 4- p33%-a67%, and 5- a100%) and four replicates in cham...

We investigated the effect of mulch on N cycling in a hardwood plantation of subtropical Australia by examining monthly in situ net N mineralization for 12 months and natural N abundance (δN) of soil and plants. Monthly net N mineralization ranged from –23.0 μg g soil (net immobilization) to 52.6 μg g soil across 12 sampling months and across both mulch and nonmulch treatments. There was a sign...

the purpose of this research was to investigate the relationship between vegetation cover and soil characteristics in order to determine the most important soil factors which affect on quantitative variations and types of vegetation cover in the study area. the study area is located in west of tehran province and southeast of hashtgerd, next to najm-abad village. after field studies, the index ...