The co-dominant AFLP marker was successfully converted into simple and applied SCAR markers.Two

special SCPM166 and SCPM66 were designed according to the sequence information of AFLP fragments.The SCAR-PCR

result showed that the resistant parent,resistant F₂ plants and hybrid plants possessed 166 bp fragment,while

the susceptible parent and susceptible F₂ plants did not possess any fragments by primer SCPM166.This

indicated that the SCAR marker could identify susceptible homozygous single plant.The susceptible

parent,susceptible F₂ plants and hybrid plants possessed 66 bp fragment,while the resistant parent and

resistant F₂ plants did not possess any fragments by primer SCPM66.This indicated that the SCAR marker could

identify homozygous resistant single plant.By joint application of these 2 dominant SCAR markers,homozygous

resistant plant and homozygous susceptible plant could be identified simultaneously.It is equivalent to a

commonly dominant SCAR marker.

Taking KCI and K₂SO₄ produced in Russia,Luobupu K₂SO₄ produced in Xinjiang and K₂SO₄ produced in

Kaifeng as experimental materials,the experiment was carried out to study the effects of different K sources

and applying dosage on cabbage varieties of‘Redai’and‘Moyu’.The results showed:potassium application

could increase cabbage yield，the content of protein and VC,decrease the content of nitrate.When the amount

of K application was 300 kg·hm^-2,the effects of Luobupu K₂SO₄ was better than or close to the other K

sources.K₂SO₄ produced in Russia and K₂SO₄ produced in Kaifeng had the worst effect.Potassium application

increased‘Redai’output value by 29.9 %-33.2 %,and that of‘Moyu’by 15.8 %-20.5 %.Utilizing return

equation,it gained the best economical potassium application for‘Redai’was 354.0 kg·hm^-2,the highest

output value was 98 463.4 Yuan·hm^-2;that for‘Moyu’was 333.0 kg·hm^-2 and the highest output value was 98

201.2 Yuan·hm^-2.

Effect of exogenous allelochemical vanillic acid on soil enzyme activity and soil nutrient for

pepper seedling was studied in this article.The results showed that 4 kinds of soil enzyme activities were

increased along with the increase of vanillic acid concentration.Furthermore,polyphenol oxidase activity

increased by 13.3 %，compared to the control when vanillic acid concentration got 1×10^-7 mol·L^-1.The

contents of soil organic matter,available P and available K tended to decrease with the increase of vanillic

acid concentration.While the soil NO-3-N content tended to increase.Relations between the 4 soil enzyme

activities and soil organic matter content,available P and available K were significantly negative.But their

relation with soil NO-3-N contents was significantly positive or very significantly positive.

Cucumis melo L.seedlings of‘Yindi No.3’and‘Xizhoumi No.1’were used to study the effects of

different root-zone temperatures on chlorophyll content,photosynthesis and chlorophyll fluorescence

parameters by Eco-organic soilless cultivation experiments.The results indicated that chlorophyll content,net

photosynthetic rate(Pn)，stomatal conductance(Gs),stomatal limitation value(Ls),transpiration rate

(Tr),chlorophyll fluorescence（F），photochemical quantum yield(Yield),photochemical quenching(qP)and non-

photochemical quenching(NPQ)were decreased with the decreasing of root-zone temperature.The decline of net

photosynthetic rate of Cucumis melo L.was caused by non-stomatal limitations under low root-zone

temperature.Inhibition of PSⅡ photochemistry activity is one of the important causes for low net

photosynthetic rate of Cucumis melo L.seedlings under low root-zone temperature.

Taking three different sweet pepper varieties as test materials,and sun shade net to stimulate

artificial low light environment,this paper studied the effect of low light on the growth of different sweet

pepper varieties.The results showed that after 85 % low light treatment,the bud stage,flowering period,the

door pepper fruit setting period,two-layer pepper fruit setting period,harvesting period and defeat seedling

stage of the three varieties were obviously delayed,compared with the control.The fresh weight of single

plant leaves decreased 43.97 %-77.26 % and the number of leaves per plant reduced 12.95 %-63.74 %.The longer

the low light treatment last,the greater the amount of reduced.Among these 3 tested varieties,J04 has the

stronger resistence to low light.Under low light conditions,its plant height,stalk thickness,number of single

plant leaves and fresh weight of single plant leaves were kept in a high value,and its number of fruit

setting was also the highest.

The inhibition effects of pathogen mycelium of watermelon Fusarium wilt in indoor and field control

effect were tested by using endophyte R14，R21，S11and Ha8 introduced from Zhuhai Agriculture Research

Center.The result showed that the inhibitory rate of endophyte R14，R21 and S11 to the fungus of watermelon

Fusarium wilt in indoor were over 80 %;The control effect of,watermelon Fusarium wilt in field were over 60

%,firstly by pouring endophyte Ha8 fermentation broth to root,and then by pouring endophyte R14 and S11

fermentative liquid to root for the second,third and fourth times.

Through investigating the aquatic vegetable resources and productions in 14 counties and cities of

the middle and south area of Anhui Province,62 accessions of aquatic vegetable resources were

collected,including 18 accessions wild resources,44 accessions of local cultivars.Some special local

cultivars such as‘Xuehugong’ou’，‘Tongchengshuiqin’，‘Jixishuiyu’and‘Lujingqinya’,etc.was

collected.And cultivation and production of aquatic vegetables in middle and south areas of Anhui Province

was also investigated.According to the result of investigation,suggestion was put forward that water dropwort

cultivated in our country should be two kinds.One is Oenanthe javanica(BL.)DC.,and the other is Oenanthe

sinensis Dunn.

‘Jinqiu 65’is a new earlymaturity autumn Chinese cabbage F₁ hybrid developed by crossing self

-incompatible lines H38 with H218.Its growth period is about 65 days.The plant is 45 cm in height,55 cm in

width.Its leaf head is 37 cm in height,14 cm in diameter and 2.5 kg in weight.The plant type is compact and

with dark green leaves,moderate leaf-wrinkle and light green petiole.The leaf head is overlapping on top.It

has higher resistance to downy mildew,soft rot and virus than‘Qiulu 60’.It can yield about 60 t·hm^-2.

‘Hangza No.1’is a new early maturity tomato F₁ hybrid,developed by crossing 8947-1-2-2-3-1 as

male parent with 9905-1-2-1-1-1 as female parent.It is about 113 days from sowing to harvesting.It is a

variety with indeterminate growth and red color fruit．Its average single fruit weight is about 200 g.Its

fruit hardness is 0.97 kg·cm^-2.It is good for storage and transportation.It has excellent quality.Its VC

content is 159.0 mg·kg^-1 and licopene content is 32.4 mg·kg^-1.The soluble solid content is 5.03 %.It is

resistant to leaf mold.It can yield about 90 t·hm^-2.It is suitable for plastic shed cultivation in spring or

in protected field in early spring in the Yangtze River Valley.

‘Beiyan No.1’takes 05B-91 as female parent,and 05B-93 as male parent.It is a F₁ hybrid tomato

with hard flesh and big fruit.It belongs to boundless growth type with middle early maturity.Its growing

period is about 106 days.Its matured fruit is red in color and of flat round shape.Its soluble solid content

is 4.8 %,VC content is 114.4 mg·kg^-1,soluble general sugar content is 2.7 %.It is resistant to leaf mould

and ToMV.Its fruit hardness is 0.84 kg·cm^-2.It is tolerant to storage and transportation.The average single

fruit weight is 192.7 g.Its yield is about 90 t·hm^-2.It can be cultivated in open or protected fields all

over China.

‘Yinzhu’is a new mid-maturity F₁ hybrid of muskmelon developed by crossing C70(03TM25-4)as female

parent and C69 as male parent.In open field,its whole growing period lasts about 98 days and its fruit

development period is about 50 days.It has strong growth vigor.It is resistance to leaf blight and downy

mildew,mid-resistance to powdery mildew.The fruit shape index is about 1.1.It has long round fruit with

milky-white skin,with or without sparsity net.The fruit flesh is white-green and about 3.5 cm in

thickness.The soluble solid content is 15 %-17 %.Its firm rind is suitable for transportation.The fruit

weight is about 1.1 kg.The yield is about 31.5 t·hm^-2.It is suitable for cultivation open or protected field

in Northwestern China.It extension area is about 13 000 hm².