Study On The Effect Of Nitrogen Dose On Quality Changing Pattern And Quality Stability Of Wheat Grown In Heilongjiang Province

Six wheat cultivars and a pair of NlL differing on Glu-Dl locus were emplOyed to cnyout pot experiment under five nitrogen doses to identify the quality changing pattem.Meanwhi1e, A multiple locations experiment to stUdy the effect of nitrogen on Wheat qualityand the correlation of quality parameters as well as quality stability using ten wheat cultivarsdiffering in quality under three nitrogen rates were conducted.Effect of nitrogen dose on quaIity ckanging pattern of wheat grown in HenongjiangprovinccThe quaIity changing pattem affected by nitrogen dose varies on quality pararneters.Some representative parameters of dough strength including dough development time,stability, valorimeter value, W and P of a1veogram as well as Zeleny sedimentation valueshow the parabola shape in changing pattem aIong with nitrogen dose raising. N3 is the peakof the parabola while N2N3 is the peak of parabola only for stability of fdrinogram. For thequantity of gluten, itS peak aPPears at N4 level, being higher than that of dough strengthparameters. As a parameter representing gluten strength, glUten index decreases when nitrOgendose rise. The ratio of sedimentation value and dry gluten content representing gluten strengthindirectly decrease or change in inverted parabola along with nitrogen rates raising .P/L goesdown when nitrogen level increasing. For most varieties te5ted in the study, water absorptionrise along with nitrogen dose increase while it goes in parabola or invert parabola for othermaterials.Compare HWGS 5+l0 to itS countefPart 2+l2, the POsitive effect of 5+10 is main1y onZeleny sedimentation value, weakness and the ratio of sedimentation and dry gluten, itshowed maximum effectS at nitrogen dose of paraboIa Peak.The nyulation of nitpogen dose on quality parameters of wheat growu in HeilongjiangprovinceCompare with geOOtyPe and environment, nitrogen plays less importan role on wheatquality However, the effed of nitrogen on qua1ity varies with quality parameters. For glutenquantity and water absorphon, effod of nitrogen is second onIy to genotyPe. To otherparameters, the effect of dsgen is less than that of genotype and environment. The effect ofnitrOgen on gluten index and ratio of sedimentation and dry glUten is very little.When the tested marerials were grouped on quality parameters, driction order ofexperimental faCtors were changed when the cultivars were grOUped on glUtCh content, theorder of factors fiJnction tO glUten content is: nitrogen > environment > genotyPe. When thevariehes were gI'OuPed on sedimentation value, the oIder of factors function tO sedimentationvalue is f environment > genotype > nitrOgen. For the materials of high gluten content,HMWGS composition of 2+l2 7+9 l (2*) and low sedimentation value, the function ofexperimental fectOrs to water absorPtion is t genotype > nitrogen > environment > ExGwhi1e it is genotoe > nitrogen > ExG > environment for the materials of low gIuten content,HMWGS comPOsition of 5+l0 7+8 (9) l (2*), 2+l2 7+8 l (2*) and high sedimentaion.When the materials were grouPed on glulen colltent and sedimehaion value, the functionorder of the experimental factors to stability of fdrinogram is f genotype > environment >Gxgrnitrogen. For the materiaIs with subunit 5+l0, the fiJnction order to stability is;environment > genotyPe > nitrOgen, while genotype > environment fOr the materials withHMWGS of 2+12 7op 1 (2*) and no significant effect for the materials with HWGS of2+l2 7+8 l (2*). All these demonstrated that nitrogen play impotalt role to gluten contentand water absorption, less dripotalt role to sedimentation value and boograIn parametersand very Iittle or no POsitive effect on the parameters relevant to gluten strength.The caPacity of nitrogen regulation to wheat quaIity varies with materials grouped ondifferent parameters. The gIuten quantity of the materiaIs with high gluten content is affectedby nitrogen in lar'ger extent than...