in order to study of nitrogen absorb and use efficiency of wheat (triticum aestivum) and wild oat (avena fatua) at vegetative growth stage, a factorial experiment was conducted based on completely randomized block design with three replications in research greenhouse of faculty of agriculture, at ferdowsi university of mashhad in 2008. the first factor was competition between wild oat (densitie...

ABSTRACT Scarcity of good quality water is a limiting factor for irrigated agriculture, especially in semi-arid regions, which induces the use waters with high salt concentration crop irrigation. In view above, objective this study was to evaluate phytomass accumulation and production components colored cotton genotypes during different development stages, under conditions salinity, plants grow...

This study aimed to design and implement a subsurface irrigation system using porous emitters of various materials such as bubblegum, flannel, cotton, spandex. It was carried out descriptive methods, namely designing, measuring, observing, calculating, analyzing data quantitatively. The results showed that the soil conductivity ranges from 1.0 3.01 cm3/hour, flannel material transmitter has max...

Potassium (K) fertilizer management is beneficial for improving growth, yield and yield components of field crops under moisture stress condition in semiarid climates. Field experiments were conducted to study the response of maize (Zea mays L., cv. Azam) to foliar and soil applied K during summer 2013 and 2014. The experiments were carried out at the Agronomy Research Farm of The University of...

introduction lentil with about 28 percent protein occupies the second after soybean. it is one of the major crops in developing countries as a complement to cereals and is an excellent source of protein and amino acids in the diet. results of studies shown that for most crops, including lentil, the occurrence of drought stress in some phenology stages cause irreparable damages to yield. therefo...

Twenty five Sri Lankan modern rice cultivars were screened for submergence tolerance at seedling and vegetative stages. An experiment was carried out at the Faculty of Agriculture, University of Ruhuna, Mapalana, Kamburupitiya, Sri Lanka during May to September, 2011 according to the randomized complete block design (RCBD) with 4 replicates and each replicate contained 20 plants to evaluate sub...

bitter asafetida (ferula assafoetida l.) is one of the medicinal-rangeland plants belonging to apiaceae family. the resin which is through incision secreted of the root has medicinal properties. the effect of rain on resin yield of this plant is one of problem of natural resources offices. the main aim of this study was to find out the effects of the irrigation on the resin yield, plants surviv...