A simple, rapid and sensitive multiresidue method has been developed for the determination of ten organophosphorus and organochlorine pesticides, commonly used in crop protection. The analysis uses a miniaturised extraction with ethyl acetate followed by large volume injection (10 microL) GC-EI-MS analysis in SIM (selective ion monitoring) mode. Sensitivity and selectivity of the method were ac...

The full control of positional selectivity is of prime importance in C-H activation technology. Chelation assistance served as the stimulus for the development of a plethora of ortho-selective arene functionalizations. In sharp contrast, meta-selective C-H functionalizations continue to be scarce, with all ruthenium-catalysed transformations currently requiring difficult to remove or modify nit...

The paper explores the potential of Khao Dawk Mali expansion in Northern Thailand as well as presents estimation of demand for variable inputs and choice of rice varieties as jointly determined by the profit-maximizing farmers. Results reveal that, Khao Dawk Mali provides economic advantage over glutinous varieties and can be conceived as a better alternative crop particularly in areas with ina...

Introducing concerns about land fertility for landlords in a Principal –Agent model of sharecropping with moral hazard, we show that the optimal contract under limited commitment reflects a trade-off between production and land quality maintenance. Using data from the Philippines, a model where the leasing out and contract choices are simultaneous is estimated and avoids the selectivity bias of...

AIMS To develop selective media for the enumeration of Botrytis cinerea. METHODS AND RESULTS Two new media, Botrytis Selective Medium (BSM) and Botrytis Spore Trap Medium (BSTM), were developed and compared with currently available media for the enumeration of B. cinerea conidia from the environment. The new Botrytis media proved advantageous over previous media because they were easier to pr...

Selectivity index is a way of assessing the discrimination herbicide to given crop by observing its effects on and weeds. The aim was obtain selectivity indaziflam sugarcane cultivar IACSP95-5000 as function five weed species in two soils textures. experiment carried out greenhouse at Piracicaba, São Paulo, Brazil. treatments consisted doses (0; 12.5; 25; 50; 100; 200; 400; 800 1,600 g active i...

crop productivity, water use efficiency (wue), and microbial biomass c and n in rainfed dry area are influenced by tillage, rotation, and crop residue management. field experiments were conducted during 2005-08 to study the effect of tillage, crop rotation, and crop residue retention on oat fodder yield, water use efficiency, and microbial biomass c (mbc) and n (mbn) under semi-arid conditions ...

Setting the right intensity is crucial for success of post-emergence weed harrowing in cereals. The percentage crop soil cover (CSC) correlates with selectivity harrowing. Therefore, real-time camera-based measurements CSC offer a novel approach to automatically adjust varied by hydraulic steering tine angle. Five field experiments cereals were conducted at three locations southwestern Germany ...