Afield experiment was conducted in the oasis region of Shiyang River basin, Gansu Province to research the effect of alternate partial root-zone drip irrigation(ADI) and conventional drip irrigation(CDI) on soil water distribution, cotton growth, yield and water use efficiency(WUE). The results showed that ADI provided smaller stomata opening to reduce the useless luxury transpiration loss, the height of cotton under ADI was restricted under low irrigation level, but not significant under high level. Results showed that compared with CDI, seed cotton yield under ADI increased by 21.1% with total water use efficiency and irrigation water use efficiency being improved by 17.9% and 20.9%, respectively. Results also showed that seed cotton yield under ADI had no significant difference with 30.8% water being saved. It suggesteds that ADI is a practiced irrigation method which should be researched and applied in cotton producing of arid areas.
The immune protection tests of the infectious bursal disease(IBD) commercial vaccine strains B87(in) and FW2512 against the four Guangxi isolates 040124,BH11,TSC-2(9) and YL052,the cross-protective immunity tests among the four isolates,the protection contrast tests of the multivalent inactivated oil-emulsion vaccine(OEV) from isolates 040124,BH11 and TSC-2(9) at different immune dosages and a protection contrast test of the multivalent inactivated OEV with the OEV developed from the reference virulent strain CJ801-BKF were conducted respectively.The results showed that the two commercial vaccines could not provide full protection against the four field isolates,while 100% protections were obtained with the OEVs of the four isolates against the homogeneous viruses,and the OEV of 040124 provided the highest cross-protection.Birds vaccinated with OEVs of isolate TSC-2(9) had the lowest protection of immune organs against the challenge of isolates by having significant difference in immune organs index(IOI) compared with the un-infected control birds(P0.05),while the birds vaccinated with OEVs of isolates 040124,BH11 and YL052 had no significant difference in IOI compared with the uninfected control birds(P0.05).Immune protection index(IPI) of the multivalent OEV with 3 different immune dosages of 1mL,0.5mL and 0.25mL was from 80% to 100%,per bird dosages 1mL had significant higher IPI than that of dosage 0.25mL(P0.05),while dosages 1mL and 0.5mL had no significant difference on IPI(P0.05).These results demonstrated that the immune efficacy of multivalent OEV was the best among all the OEVs tested,which might be used for the prevention and control of IBD in Guangxi.
Based on the meteorological data collected from 17 stations in recent 50 years in Shiyang River Basin, the reference crop evapotranspiration(ET_0) was calculated with the Penman-Monteith equation recommended by FAO in 1998. The correlation of altitude with ET_0 was analyzed. Spatial variation of ET_0 was obvious and the value increased from mountainous area to oasis plain in Shiyang River Basin. Spatial distributed model of reference crop evapotranspiration in Shiyang River Basin was obtained with MapGIS6.5 Arcview3.1. In this study, only the impact of altitude on spatial distribution of reference crop evapotranspiration was considered, the radiation and temperature on hillside were not adjusted yet.
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