جستجوی مقالات مرتبط با کلیدواژه "عملکرد گندم دیم" در نشریات گروه "منابع طبیعی"

One approach to improve remote sensing techniques relies on the spectral response to infer soil and crop properties. The aim is to develop methods that can identify inferring factors so that they can be removed during later analysis. Differences in spectral reflectance can be the base of detecting crop residue and growth of crop in different tillage management. This experiment was conducted under dryland conditions to determine the influence of crop residue remained on soil surface in conservation and conventional tillage systems on soil moisture, canopy temperature and grain yield and also yield components of a winter wheat. Remotely sensed data were acquired three times prior to canopy closure using a handheld thermal imager (7,000 to 14,000 nm). According to results, differences between yields were significant (P<0.01). The yield of no-till treatment with all previous crop residue (NT2) was slightly more than that for no-till with only standing previous crop residue (NT1). Also, the yield of reduced tillage system (CD) was 31% higher than that for conventional tillage system (MD). A similar trend was observed for wheat biomass yield. No-till treatment increased soil moisture content in the 0–30 cm layer. At the flowering stage, soil bulk density in 0-20 cm depth was significantly lower for NT2 (the no-till with total residue) compared to MD and CD treatments. During the flowering stage, residues in NT1 and NT2 lowered the canopy temperature by 3-9 °C over other treatments (MD and CD). Results of this study indicated that for a dryland vetch-winter wheat cropping system with annual precipitation of 251 mm, NT2 had higher grain yields (762 kg ha_1) than that obtained by MD system.

Effects of tillage on wheat yield in forage-wheat rotation are still unknown in Iran. So, this study was performed in order to investigate the effects of different methods of tillage on soil physical properties and yield of dryland wheat in rotation with spring forage hay. This experiment was carried out with 6 treatments and 3 replications for 3 years in RCBD statistical design in Maragheh region. The results showed significant differences for yield components in spring planted forage-wheat rotations affected by the treatments.T1 treatment (chisel plough + cyclotiller + wheat grain driller) had the highest stubble (4.320 ton/ha), grain (2.398 ton/ha) and biologic yield (6.720 ton/ha) and also harvesting index (33.89 %). Soil moisture was significantly different in 3 soil depths between treatments, and T1 treatment had the highest soil moisture in all depths. Bulk density differences was significant in 3 depths andT1 treatment had the lowest bulk density in three depths The results of this study suggest the application of "chisel plough + cyclotiller + wheat grain driller” for wheat production in rotation with winter and spring vetch forage.