arkansas produces the most rice in the us.
arkansas produces the most rice in the us.
what state produces the most rice in the us?
arkansas
a number of diseases and pests pose threats to rice cultivation within the state of arkansas. one such culprit, "pyricularia grisea," commonly known as rice blast, is an invasive fungus that spreads primarily through infected rice stubble from the prior year, related host species and even sometimes infected seed. though epidemics of the fungus seem to be sporadic (infected seed most likely accounts for the randomness in distribution of the rice blast in arkansas rice fields), "rice blast has caused significant yield losses in arkansas." another disease that is actually "second only to, and often rivals, rice blast in importance" is sheath blight, which is a soil borne pathogen the initial symptoms of which commonly begin with "lesions on the sheaths of lower leaves when plants are in the late tillering or early internode elongation stage of growth." the weed that poses perhaps the largest threat to arkansas rice is barnyard grass, due to its "widespread resistance to propanil and quinclorac, two of the most frequently used herbicides." along with this, "weedy red rice ("oryza sativa") is a problematic weed in cultivated rice," and of the rice fields in arkansas that account for 50% of the nation's rice crop, "about 60% of these...have some red rice infestation." weeds such as barnyard grass and weedy red rice can often have detrimental effects to rice fields throughout the state of arkansas, accounting for over $22 million worth of crop yield losses in 1992.
rice cultivation in arkansas
the operators s_x and s_y can be determined using the ladder method. in the case of the spin 1/2 case (fermion), the operator formula_14 acting on a state produces formula_15 and formula_16. likewise, the operator formula_17 acting on a state produces formula_18 and formula_19. the matrix representations of these operators are constructed as follows:









































therefore, formula_22 and formula_23 can be represented by the matrix representations:









































recalling the generalized uncertainty relation for two operators a and b, formula_26, we can immediately see that the uncertainty relation of the operators formula_22 and formula_23 are as follows:
anti-symmetric operator