| The experment used maize cultivar Yudan606 as material,and conducted by a combination of pot experiment and hydroponic experiment.We set four environments: normal environment(S1&E1),drought stress(S2&E2),high temperature stress(S3&E3),high temperature and drought composite stress(S4&E4);four fertilizer treatments: no zinc fertilizer and boron fertilizer(CK1&CK2),zinc fertilizer treatment(W1&T1),boron fertilizer treatment(W2&T2),zinc fertilizer and boron fertilizer treatment(W3&T3),the state of the maize growth,the changes of antioxidant enzyme activity,photosynthetic characteristics and yield and quality were studied,and the main results were as follows:1.Applying zinc fertilizer and boron fertilizer could promote the growth of maize under adversity stress.Compared with CK1,the stem diameter and SPAD value of W1,W2,W3 and T1,T2,T3 were increased significantly;the plant height of seedling only W1 and W3 treatments increased,while during silking stage the plant height of T1,T2 and T3 were increased.The growth of seedling root was promoted,and its configuration was also changed,root length root surface area,root volume were increased,and root diameter was decreased.The best effect was grained by the combined application of zinc and boron.2.Applying zinc fertilizer and boron fertilizer under adversity stress could enhancing photosynthetic function of maize.Under the condition of S2,S3 and S4,during seedling stage,compared with CK1,with the improvement of zinc fertilizer,the net photosynthetic rate were increased by 25.50%,16.99% and 30.28%,respectively;with the improvement of boron fertilizer it was increased by 22.16%,14.86% and 25.00%,respectively,while coordinated with zinc fertilizer and boron fertilizer it was increased by 27.44%,19.17% and 27.44% respectively.The net photosynthetic during the silking stage manifested same change trend.3.In the four different environmental conditions,applying zinc fertilizer and boron fertilizer could affect maize antioxidant enzyme activity,and improved its resistance.As compared with CK1,during seedling period,superoxide dismutase activity increased by 1.84%?3.68%?4.96% and 3.31%,respectively,peroxidase activity increased by 9.69%?8.73%?7.16% and 1.55%,respectively,catalase ctivity increased by 4.27%?5.56%?9.03% and 7.18%,respectively,and the content of malondialdehyde decreased by 13.84%?9.86%?10.99% and 13.01%,respectively.Application of boron fertilizer had lesser effect on enzyme activity,zinc fertilizer and boron fertilizer with best effect.The combined application of zinc and boron was suggested to be the best method.The changes of them during the silking stage followed the same trend.4.Application of zinc fertilizer and boron fertilizer could increase the dry matter accumulation of maize under the four differern environmental conditions.As compared with CK1,during seedling period,with the improvement of zinc fertilizer,the dry matter accumulation was increased by 14.74%?16.67%?10.47% and 9.33%,respectively;with the improvement of boron fertilizer it was increased by 3.16%?23.08%?15.12% and 12.00%,respectively,while combined application of zinc and boron it was increased by 25.26%?33.33%?32.56% and 16.00% respectively.During spinning period and mature period it showed the same trend.5.Applying zinc fertilizer and boron fertilizer under adversity stress could increase corn production,and improve kernel quality.Supplying zinc fertilizer and boron fertilizer could effectively increase the spike grain number to improve maize yield.The application of boron also increased the grain weight,and has a better effect then the application of zinc.However,under the same environmental conditions zinc fertilizer has a better effect on grain quality than boron fertilizer. |
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