Effects Of Nickel Stress On Physiological Characteristics, NPK Nutrient Absorption And Yield Of Maize

It is found that the content of nickel in the black soil increased year by year and enrichedin the surface soil and nickel contamination phenomenon has occurred in some placesaccording to previous study on black soil fertility. and resulting in deterioration of soilproperties and maize yield, lower quality. Therefore, studying the effect of Nickel luxuryabsorption on maize growth and its mechanism has important significance. This paperinvestigated the effect of different concentration nickel stress on the whole growth period ofgrowth and main physiological indexes of maize plant and NPK nutrients and yield, and this potexperiment approach to maize as materials. The results were summarized as follows:1The effects of Ni on maize plants in different developmental stages of physiologicalindicatorsGrowth period in the corn, the corn leaves can improve SOD, CAT, POD enzyme activityof Ni stress when the concentration of50mg/kg,decreased SOD,CAT,POD enzyme activity ofleaves was greater than50mg/kg. Stress concentration at Ni, SOD showed the highest activityat jointing stage and booting stage, mature stage was the last, CAT showed the highest activityappeared at the bell stage, the weakest in the mature period, the POD activity was highest in themature period, the lowest in seedling stage, while in the filling stage, the MDA content of thelargest.2The absorption and distribution of Ni on the dynamic changes of Ni in maize plantsIn the entire growth cycle of corn, Ni stress constant time, the plant organs (roots, stems,leaves, seeds, cob, corn leaves, corn) Ni content increases with increasing Ni concentration inthe soil outside source. In constant stress concentration Ni, Ni content of maize seedling rootshighest, jointing least; highest Ni content stem elongation stage, bell stage at least; Ni content inthe highest seedling leaves, bell stage least. Corn grain, cobs, corn leaves and corn Ni Nicontent required for the extension of stress time with an upward trend, Ni content is less thanthe filling stage of maturity, and at the time of maturity, corn absorption changes of variousorgans Ni content is: roots> stems> leaves> corn> corn leaf> cob> grain.3Ni corn plants at different developmental stages of various parts (roots, stems, leaves)the impact of NPK nutrientsWhen grown in a certain period of stress with increasing Ni concentration inhibits absorption of various organs of the plant of nitrogen, phosphorus, and Ni concentration of theplant will promote the absorption of potassium when50mg/kg,50mg/kg plants greater thaninhibition of potassium absorption. Ni concentration at constant stress, with the promotion ofthe growth period, Ni stress does not affect the roots of the plants throughout the growing trendof nitrogen content; does not affect the plant stems in Ni stress concentration of50mg/kg, thetrend leaf nitrogen content, and greater than50mg/kg treatment will inhibit the stem, leafabsorption of nitrogen. Meanwhile, Ni stress does not affect the corn plant roots, stems, leaveschanging trends in the whole growth period phosphorus and potassium content.4The impact on corn yield of NiIn Ni concentration of50mg/kg, can stimulate the growth and development of each growthstage of the plant, plant height and dry matter accumulation increased, improving the quality ofcob and grain and single spike Components of output indicators, and Ni concentrations greaterthan50mg/kg showed inhibition of corn, so that lower yields.