Effects of clinoptilolite on yield and nitrogen accumulation of rice under alternate wetting and drying irrigation
[Objectives]Clinoptilolite has been widely used as a soil amendment in rice production due to its positive effects of improving soil nutrients and decreasing N losses.We carried out a located field experiment to investigate the lasting effects of clinoptilolite on nitrogen uptake and yield of rice under alternate wetting and drying irrigation(AWD)[Methods]The located rice field experiment was conducted consecutively from 2018 to 2021,using a completely randomized block design.The treatments included no clinoptilolite addition under continuous flooding irrigation(ICFZ0),no clinoptilolite addition under AWD(IAWDZ0),and 10 t/hm2 clinoptilolite addition under AWD(IAWDZ10),clinoptilolite was applied in 2017 and was not applied later on.0-30 cm soil samples were collected regularly during rice growing season for determination of soil inorganic nitrogen content.Rice plant and grain biomass and nitrogen content were investigated for calculation of aboveground N accumulation and N partial factor productivity(NPFP).[Results]ICFZ0 and IAWDZ0 treatments were recorded similar yield,aboveground N accumulation,and NPFP.IAWDZ10 significantly increased rice aboveground N accumulation and grain yield for five consecutive years,compared to ICFZ0.The NPFP in IAWDZ10 was 9.67-13.44 kg/kg and 5.53-9.55 kg/kg higher than in ICFZ0 and IAWDZ0,the grain yield was 1.26-2.42 t/hm2 and 1.00-1.72 t/hm2 higher than in ICFZ0 and IAWDZ0,respectively.The aboveground biomass in IAWDZ10 was 20.96%-31.24%,16.89%-30.44%,17.87%-25.45%,and 13.43%-21.12%higher than in IAWDZ0 at periods of jointing-booting,heading-flowering,milky ripening,and maturing stage,respectively.The aboveground N accumulation in IAWDZ10 was 19.92%-47.14%,14.90%-43.88%,21.68%-31.37%,and 7.18%-30.27%higher than in IAWDZ0 at periods of jointing-booting,heading-flowering,milky ripening,and maturing stage,respectively.IAWDZ0 was tested similar soil inorganic N with ICFZ0 treatment,while IAWDZ10 treatment was tested 19.88%-40.96%higher inorganic N than IAWDZ0 treatment.The soil NH4+-N content in IAWDZ10 was 31.83%-48.84%and 28.35%-52.80%higher than that in ICFZ0 and IAWDZ0 from tillering to panicle fertilizer stage,respectively.There was no significant difference between IAWDZ0 and ICFZ0 treatment in soil total N content after harvest.T.Treatment IAWDZ10 significantly increased soil total N by 9.27%-11.41%after harvest,compared with ICFZ0.This indicated that clinoptilolite did not negatively affect soil nutrients over time,but had a lasting effect instead.[Conclusions]Under alternate wetting and drying irrigation,applying clinoptilolite in large quantities has a lasting and stable effect on improving soil seasonal NH4+-N and total N content,thereby increasing rice aboveground N accumulation,NPFP,and yield continuously.Clinoptilolite application is recommended as a green and efficient measurement for sustainable agriculture.
clinoptilolitenitrogenalternate wetting and drying irrigationriceyield
国家科技期刊平台
NSTL
万方数据
