velvetleaf (abutilon theophrasti) is one of the most important weeds of soybean fields in golestan province. a field experiment was conducted in gorgan agricultural research station in 2007 to determine the critical period for velvetleaf control in williams soybean (glycine max (l.) merr.) cultivar using a randomized complete block design with 4 replications. treatments were included two sets o...

We investigate the spectrum for frames with block size four, and discuss several applications to the construction of other combinatorial designs. Our main result is that a frame of type hu, having blocks of size four, exists if and only if u ≥ 5, h ≡ 0 mod 3 and h(u − 1) ≡ 0 mod 4, except possibly where (i) h = 9 and u ∈ {13, 17, 29, 33, 93, 113, 133, 153, 173, 193}; (ii) h ≡ 0 mod 12 and u ∈ {...

Serious Games are games that assist in the process of training or learning content and skills. Many studies report positive impact serious on for people with autism. However, many these do not use techniques known to be employed when teaching this public, such as those based Applied Behavior Analysis (ABA). ABA is a behavioral science approach uses error-free, intensive, individualized aimed at...

In this paper we find necessary and sufficient conditions for the existence of a group divisible design GDD(n, m) of index (*1 , *2) in which n=2 or m=2, thereby completing the solution of the existence problem for all n, m, *1 , and *2 . In the process, necessary and sufficient conditions are found for the existence of an x-regular partial triple system whose complement in *Kn has a 1-factoriz...

The present study proposes to measure the thermal requirements, heat and radiation use efficiency of kharif soybean cultivars (NRC 37, GS 1 2) in central region Gujarat. findings conclude that among all different geometry 30 x 10 cm produced highest seed (4403 kg/ha) total biomass yield (5818 over other two spacing because higher (heat (HUE) for Growing degree day (GDD)- 0.69 kg/ha/°C Day; HUE ...