不同促生菌配合生长调节剂处理对滩涂稻田盐分变化、水稻产量及品质的影响OA

To investigate the effects of growth-promoting bacteria and growth regulators on the salinity variations,rice yield and rice quality of the beach paddy,a rice planting experiment was conducted from June to November of 2020 in the coastal beach area of Nantong,Jiangsu Province.A two-factor split zone design was adopted,and the main zone was treated with seed immersion by growth-promoting bacteria,including clean water(CK),and growth-promoting bacteria of Rudong(RD)and Ningbo(NB).The second zone was treated by growth regulator spray,including clean water(W),"BiHu(0.136%Gibberellic Acid·indol-3-ylacetic Acid·brassinolide)"(T1)and"sodium nitrophenate"(T2).As the results,the salinity of irrigation water during rice cultivation ranged from 0.78 to 1.12 g·kg-1,and the soil salinity variations ranged from 1.11 to 1.87 g·kg-1 during the rice growth season in the CK,RD,and NB plots.Compared with CK,the rice yield increased by 4.65%and 1.83%in the RD and NB plots,respectively;and compared with W,the rice yield increased by 5.50%and 1.05%in the T1 and T2 plots,respectively.Compared with CK-W,the rice yield in RD-T1 increased the most by by 11.66%(P＜0.05),and the values of grain number per panicle and solid grain number were increased by 13.45%and 13.85%,respectively(P＜0.05).Compared with CK,the brown rice rate,amylose,and protein contents of rice in the RD plots were significantly reduced,but no significant effect was found on other quality indexes.According to the results of two-factor analysis,the growth regulator factor had a significant influence on panicle length,grains per panicle,filled grains per panicle and yield,while the growth-promoting bacteria factor had a significant influence on 1 000-grain weight.Moreover,a significant interaction was found between the growth regulators and growth-promoting bacteria specifically on 1 000-grain weight.In conclusion,growth-promoting bacteria combined with growth regulators had significant effect on the yield increase.Growth regulators mainly increased the number of grains per panicle and the number of solid grains,and growth-promoting bacteria mainly improved the 1 000-grain weight.This study provides a technical reference for exploring appropriate agronomic management measures to achieve the purpose of increasing rice yield in tidal flats areas.