Abstract:

Potato (Solanum tuberosum) is an important economic crop.It is used as food,vegetable,fodder and industrial material.Favorita is a type of superior and precocious potato varieties and adapts to plain.Research of the superior and high yield cultivation steps of potato is the important foundation of gaining the largest economic benefit and the sustainable development of potato production.To search the best density of autumn sowing potato Favorita in Jianghan plain and the effects of density on the main agronomic traits and field,6 densities,such as 4 000 holes per 667 m2,7 000 holes per 667 m2,10 000 holes per 667 m2,13 000 holes per 667 m2,16 000 holes per 667 m2,19 000 holes per 667 m2 were set.Research showed that density was highly positively associated with growth period (y=0000 8x+80514,r1=0990 7*[KG-*2]*)，significantly negatively associated with stem length (r2=-0895 1*) and highly significantly negatively associated with rate of emergency(r3=-0941 1*[KG-*2]*),stem number(r4=-0992 4*[KG-*2]*),tuber number per plant (r5=-09644*[KG-*2]*) and scale of commodity potato (r6=-0937 9*[KG-*2]*).Tuber weigh per plant had quadratic curve connection (y=-1E-06x2+0016 8x+13978,r7=-0837 0*) with density,and reached the maximum value of density 8498 holes per 667 m2.The yield had quadratic curve connection (y=-8E-06x2+0208x+15761,r8=-0726) with density and reached the maximum value of the density 12838 holes per 667 m2.The yield of commodity potato had quadratic curve connection (y=-6E-06x2+0141 9x+19395,r9=-0767*) with density and reached the maximum value of the density 11087 holes per 667 m2.The potato yield and commodity potato yield of 13000 holes per 667 m2 were inferior to 10000 holes per 667 m2,which was 16309 kg per 667 m2 and 1 109 kg per 667 m2 respectively at the first place,and had super comprehensive characters.The treatments range from 19 000 holes per 667 m2（1 3046 kg per 667 m2）,16 000 holes per 667 m2（1 2113 kg per 667 m2）,7 000 holes per 667 m2（1 2105 kg per 667 m2）to 4 000 holes per 667 m2（8091 kg per 667 m2）developed a diminishing tendency in yield.The treatments range from 13 000 holes per 667 m2（8473 kg per 667 m2）,16 000 holes per 667 m2（7679 kg per 667 s m2）,19 000 holes per 667 m2 （634 kg per 667 m2）to 4 000 holes per 667 m2（6181 kg per 667 m2）developed a diminishing tendency in yield of commodity potato.The treatments range from 4 000 holes per 667 m2（7640%）,7 000 holes per 667 m2（740%）,10 000 holes per 667 m2（679%）,13 000 holes per 667 m2（639%）,16 000 holes per 667 m2（585%）to 19 000 holes per 667 m2 （488%） developed a diminishing tendency in scale of commodity potato