| The effects of silicon calcium fertilizer and nanocarbon disposal on the growth and physiological characteristics of wheat were studied under drought stress.The results could provide a new evidence for improving crop drought resistance.Different drought-resistant wheat varieties were selected by analysising membership function values of each index in Pot experiment.The S1204 and JinTai 102 were processed by using the silicon calcium fertilizer and nanocarbon disposal to the wheat seedings under drought stress,the growth and physiological characteristics of wheat were determined.Then,Photosynthetic Gas Exchange Parameters and Chlorophyll Fluorescence Parameters were determined at the stage of jointing stage,booting stage,heading date,flowering period,filling stage in field.By determining its agronomic traits and yield in Mature,the most suitable ratio of the program of silicon calcium fertilizer and nanocarbon treatment were chosen under drought stress and provide it a new basis for drought resistance of wheat.(1)The fresh weight,dry weight,plant height,root length,root/shoot ratio,chlorophyll content,SOD activity,POD activity,superoxide anion and MDA content of six cultivars of wheat were determined.Based on the indexes,membership function values of each indexwere analysised and inferred that:JinTai 102>Yan 19>HeiMangMai>LinYuan 991>JingDong 0331>S1204.(2)With the increase of dry days,the results showed that SOD activity,POD activity,malondialdehyde content and superoxide anion content of Jin Tai 102 and S1204 increased at first and then decreased.With silicon calcium fertilizer and nanocarbon disposal,Plant height,root length,fresh weight,dry weight,chlorophyll content,SOD activity,POD activity of wheat was higher than that of control group,MDA content and superoxide anion content were lower than that of control group.G3(2000kg·hm-2)is the most suitable ratio of single application of silicon calcium fertilizer,N2(5‰)is the most suitable ratio of single application of nanocarbon,G3+N 1(2000 kg·hm-2 and 3‰)is the most suitable ratio of 3‰nanocarbon and silicon calcium fertilizer,G3+N 1(1500 kg·hm-2 and 5‰)is the premium ratio of 5‰nanocarbon and silicon calcium fertilizer,achieve the purpose of saving fertilizer.The SOD activity and POD activity of S1204 were higher than that of JinTai 102,the MDA content and superoxide anion of S1204 was less than that of JinTai 102,which effectively alleviated drought stress.(3)As the jointing period,booting stage,heading date,flowering period and grain filling stage under drought stress,Photosynthetic gas exchange parameters(Pn,Tr,Gs)and Chlorophyll fluorescence parameters(ETR,?PS? qP,Fv/Fm)of S1204 and JinTai 102 increased at first and then decreased,intercellular CO2 concentration decreased at first and then increased.And during the filling period,in addition to intercellular CO2 concentration,other photosynthetic gas exchange parameters,chlorophyll fluorescence parameters of the factors affecting the size is silicon calcium fertilizer>varieties>nanocarbon,the best level of each factor:silicon calcium fertilizer for the G3(1500kg-hm-2),the variety is JinTai 102,nano-carbon for the N1(3‰).(4)In the mature period,plant height,panicle length,dry weight,yield of S1204 among different treatments is G2+N2>G2+N1>G3>G1>N2>N1,JinTai 102 among different treatments is G3+N1>G1+N1>G2>G1+N2>G3+N2>CK.The number of spike,1000 grain weight,grain number of spike is positively correlated with actual yield,The correlation coefficient is the spike number>1000-grain weight>grain number per spike,indicating that the spike number plays an important role in the improvement of wheat yield.The optimum level of each factor was:G3(1500kg·hm-2)was silicon calcium fertilizer,the variety was JinTai 102,nanocarbon was N1(3‰). |
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