Effects of partial substitution of chemical fertilizer by organic fertilizer on rapeseed yield,quality and fertilizer utilization rate as well as soil properties
This research aimed to provide theoretical basis for improving the quality and efficiency of rapeseed production by revealing the effects of fertilizer reduction and combined application of organic and inorganic fertilizers on yield,quality and soil nutrients of rapeseed.With"Zheyou 938"and"Ganyouza No.8"of rapeseed as experimental materials,five treatments were set up,including no fertilizer application(CK),conventional fertilizer application(T1),optimized fertilizer application(T2),organic fertilizer substitution of 15%chemical fertilizer application(T3),and organic fertilizer substitution of 30%chemical fertilizer application(T4),to research the effects of partial substitution of chemical fertilizer with organic fertilizer on yields,fertilizer utilization ratio,quality and soil physical and chemical properties of rapeseed.The results showed that compared with conventional fertilization application treatment and optimal fertilization application treatment,the application of organic fertilizer significantly improved the yields and agronomic utilization rate of rapeseed.When the substitution rate of organic fertilizer reached 30%,the increase rate of yields on rapeseed was the highest,ranging from 36.24%to 46.36%.The oil content and saturated fatty acid content were 38.6%and 5.77%,respectively.In addition,T4 treatment could improve soil quality and structure,activate available nutrients,and enhance soil fertility.Compared with conventional fertilizer,the contents of alkali hydrolytic nitrogen,available phosphorus and available potassium increased by 6.70%-34.27%,9.25%-17.00%and 32.45%-83.78%,respectively;soil pH value and cation exchange capacity increased by 2.73%-4.22%and 12.65%-55.33%,respectively,while soil bulk density decreased by 5.79%-16.30%.Substituting chemical fertilizer with organic fertilizer under equal nutrient supply combined with fertilizer reduction can improve the yields,quality and soil nutrient content of rapeseed.Under the experimental conditions,replacing 30%chemical fertilizer with organic fertilizer has the best effect,which can promote the recycling of nutrients and give consideration to the high quality and high yield of rapeseed and good physical and chemical properties of soil.
organic fertilizeryieldsoil physical and chemical propertiesqualityrapeseed
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