Journal: Journal of Cleaner Production
Journal: Environment Pollution, Elsiver
Summary:The single layer Penman-Monteith (PM) method is widely used method for the estimation of crop evapotranspiration (ET c). The accuracy of ET c estimate relies upon the quality of input weather data and capacity to approach adequately canopy (r c) and aerodynamic resistance (ra). In this study, the PM method was used to estimate daily crop evapotranspiration of irrigated maize for the years 2013 and 2014 in a sub-humid region. Four different approaches (Monteith, Katerji-Perrier, Todorovic, and Jarvis) were used to estimate canopy resistance and, then after, crop evapotranspiration by PM equation were evaluated.
Summary: The primary objective of this study was to evaluate the performance of the time-domain reflectometry (TDR) technique for daily evapotranspiration estimation of peanut and maize crop in a sub-humid region. Four independent methods were used to estimate crop evapotranspiration (ET c), namely, soil water balance budgeting approach, energy balance approach-(Bowen ratio), empirical methods approach, and Pan evaporation method. The soil water balance budgeting approach utilized the soil moisture measurement by gravimetric and TDR method.
Summary:The prime objective of the study was to investigate the effect of sowing date and nitrogen application rates on maize dry matter, grain yield and nitrogen use efficiency under rainfed and irrigated condition. The field experiment was a randomized split plot design with three replicates. Sowing date was taken as the main plot and nitrogen rate was considered as the subplot under both irrigated and rainfed conditions. Two planting dates were considered, namely; timely and late sowing scenarios. Grain yield and other yield parameters (kernel number, and cob number), plant dry matter weight, agronomic efficiency (AEN), partial factor productivity of nitrogen (PFPN), and nitrogen use efficiency (NUE) were measured.
Summary: Temperatures have a major effect on potato crop growth and yield attributes during the crop growing season. In this study, the SUBSTOR-Potato model was used to simulate the potato crop growth and yield in a subtropical region of West Bengal comprising of three districts, namely West Medinipur, Bankura and Birbhum in India. Also, the effect of temperature and planting dates scenario on potato crop growth was evaluated by using 30 years historical weather data of the aforesaid districts.
Summary:Leaching of fertilizers and pesticides to the groundwater represent an important problem to public health because of possible contamination of drinking water. Soil and climatic conditions are also important factors controlling NO3 leaching. Soil drainage, depending mainly on precipitation or irrigation rates, also plays a key role in nitrate leaching.
Summary:The soil conservation service (SCS) methodology for computing direct runoff , using soil-cover-moisture complexes involves the selection of a runoff curve number (CN) for such complex events. This method has been further simplified by introducing an assumption on initial abstraction, with only one unknown parameter CN, which is represented by the potential retention capacity of the watershed (S).