Effects Of Continuous Potato Cropping On Salt Accumulation And Ion Composition

Potato industry has become a focal point for agriculture, rural economicdevelopment, to promote agricultural efficiency and rural incomes important pillarindustry in Gansu Province. In terms of food security also plays a very important role.In the Yellow river irrigation area of the central Gansu Province is China’s majorprocessing potato production and seed base production. Located in the district of stateJingtai Tiaoshan Farm in potato production orders based, strong orders difficultiescaused cropping rotation, potato cropping serious obstacles, planting efficiency ofenterprises had a serious impact. Based on the potato field experiment of our group inthe area, to collect potato topsoil under Cropping, analyze the changes of soil total saltaccumulation and ions, to ascertain the relationship between soil salt and croppingobstacles, to alleviate and overcome potato cropping obstacles and to provide ascientific basis.The main results were as follows:Effects of continuous potato monoculture on total salt.The results show that total salt had a significant increase with years ofcontinuous potato monocropping, the content total salt of CP3、CP5and CP6haveincreased(60.23%,122.73%and151.14%) than RP in2011. In2012, the content totalsalt of CP3, CP4, CP6and CP7have increased(33.82%,47.41%,100.74%and55.56%) than RP. In2013, the content total salt of CP3、CP4and CP5haveincreased(89.9%、155.6%and157.6%) than RP. With increasing years of continuouscropping, soil electrical conductivity (EC) has been rising, in2011, CP3, CP5andCP6processing the surface soil electrical conductivity than RP has increased13.04%,34.78%and43.48%, respectively. In2012CP3, CP4, CP6and CP7processing thesurface soil conductivity compared with the RP has increased101.76%,58.82%,97.06%and113.53%,respectively.In2013CP3, CP4and CP5processing the surfacesoil conductivity than RP has increased41.7%,41.7%and56.3%, respectively.Effects of continuous potato monoculture on ions composition.Cationic content of K+compared with rotation control, increase amplitude islarger, in2011, CP3, CP5, CP6treatments increased by75.76%,218.18%and166.6%respectively; in2012, CP3, CP4, CP6treatments increased by21.21%,39.39%and203.03%respectively; in2013,CP3, CP4and CP5processing K+content increasedby40.0%,60.0%and73.3%respectively. Followed by Na+, its content in dealing with a significant difference between, in2011, CP3, CP5, CP6treatments content ofNa+increased by23.08%,49.23%and110.77%respectively than control; in2012,CP3, CP4, CP6treatments increased by13.33%,33.33%and23.33%respectively; in2013, CP3, CP4and CP5treatments increased by47.6%,52.4%and57.1%. Anion inCl-was bigger, in2011, CP3, CP5, CP6content of Cl-increased by41.67%,208.33%and275.00%respectively than control; in2012, CP3, CP4, CP6, CP7processingincreased76.67%,76.67%,166.67%and140.00%respectively; in2013, CP3, CP4and CP5treatments increased by100.0%,150.0%and455.0%.Content of Ca2+along with the continuous cropping years drops, in2011, CP3,CP5, CP6treatments content of Ca2+reduced by16.67%,8.33%and12.50%respectively compared with RP; in2012, CP6, CP7processing was reduced by25.00%and40.16%respectively; in2013, CP3, CP4and CP5treatments content of Ca2+compared with crop rotation was reduced by23.3%,32.1%and48.2%.The overall trend of speculation, there are four kinds of ions in the processcontributed greatly to the accumulation of salts in the soil, they are Na+, Mg2+,HCO3-, Cl-. Soil salinization is mainly by salt accumulation of years of continuouscropping they are NaCl, MgCl2, NaHCO3, Mg (HCO3)2sEoSilP, vaanldu ews iathr et haeb oevxet e2n0s%io,n aoftfe rt hceo ndteingureoeu so pf oatlaktoa limneo npo,oc tuetalcttou.. r ceo Btnhyte in csuoaloicul usil sac tairoloknpa,pl iiannlgelincreases.Effects of continuous potato monoculture on pH.The pH value was declined with the years of continuous potato monoculture, betweensoil pH and Cropping showed a significant or very significant negative correlation(R2=0.443-0.871*/**).Effects of continuous potato monoculture on total salt and composition of soilsalinity at different growth stages.The performance of the different treatment of total salt content in the soil at eachgrowth stage is different, RP-CP3’s highest total salt content in tuber formation period,and CP4-CP5total salt content of the treated at the tuber enlargement, has reached thelevel of moderate salinity, affecting the number of potato tuber which reduces thepotato production.K+, Ca2+,Mg2+are in the tuber formation content reached to a high level, Na+,Cl-and SO42-content in the tuber enlargement showed a higher level, HCO3-in maturity levels reached the highest; CO32-with the growth of the continued to rise.In summary, the potato cropping soil made the accumulation of total salt, andion composition changes, thereby affecting the normal plant metabolism, growth anddevelopment of the potato is blocked, resulting in a significant decline in tuber yield.