We introduce normal deleting automata with a restart operation (norm-DRA) and contextual grammars with regular selection (CGR). Both norm-DRA and CGR allow to describe syntax of (natural) languages as reduction systems. Some previously studied classes of contextual languages can be expressed using both norm-DRA and CGR. We give a hierarchy of some subclasses of norm-DRA and show the correspondi...

The rate of N uptake of crops is highly variable during crop development and between years and sites. However, under ample soil N availability, crop N accumulation is highly related to crop growth rate and to biomass accumulation. Critical N concentration has been defined as the minimum N concentration which allows maximum growth rate. Critical N concentration declines during crop growth. The r...

in order to evaluate intercropping of summer savory (satureja hortensis l.) and persian clover (trifolium resupinatum l.), an experiment was conducted at agricultural research station of ferdowsi university of mashhad in 2004 growing season. treatments were sole cropping of persian clover (eight rows), double-row intercropping of persian clover and summer savory with 27, 40 and 80 plants.m-2 (e...

in order to evaluate the effect of intercropping with replacement and additive series for hemp (cannabis sativa l.) and sesame (sesamum indicum l.), a field experiment was conducted during growing season 2006-07 at the agricultural research station of ferdowsi university of mashhad, iran. a randomized complete block design with three replications was used. treatments included different combinat...

in order to study physiological characteristics of rainfed bread wheat genotypes, an experiment was conducted with 20 genotypes in a randomized complete block design with 4 replications under rainfed and supplementary irrigation conditions. this experiment was carried out at the dryland agricultural research institute (dari) in maragheh during 2007-2008. to determine growth indices, sampling wa...

A field experiment was conducted during Kharif 2022 at Crop Research Farm, Department of Agronomy, SHUATS, Prayagraj (U.P) to determine the “Effect nano zinc and foliar application boron on growth yield finger millet (Eleusine coracana L.)”. The laid out in Randomized Block Design comprising 10 treatments which include three levels [Nano 300 ppm, 600 900 ppm] Boron [0.1%, 0.3% 0.5%], whose effe...

the current study was carried out to examine sugar beet growth pattern in climatic conditions of hamedan, iran and to recognize the factors affecting its quantity and quality as well as the physiological indices. two sowing date experiments were conducted on the basis of a randomized complete block design with four replications and 11 harvests. the plots were destructively sampled and the growt...

Two field experiments were conducted at Yezin farm and Sepin research farm, Yamenthin, Myanmar to investigate the effect of different mulching materials on growth, soil moisture weed infestation maize identify most
 farms, Yamethin, most suitable for cultivation in study areas during dry season (October, 2019 March, 2020). The used randomized complete block design (RCB) with three replicat...

Zinc (Zn) is an essential needed for the growth and development of plants, however, Zn continuously increasing in our soils which decreasing crop production. Further, crops grown on Zn-deficient also contains a low amount major reason deficiency humans. So, it mandatory to supply fulfil needs with corresponding increase grain Zn. Therefore, present study was performed determine impact different...