Effects of Different Nitrogen Forms on Cucumis sativus L.Growth and Nutrient Elements Absorption and Utilization
In order to explore the effect of different nitrogen forms on Cucumis sativus L.growth and nutrient ele-ments absorption and utilization under the same nitrogen level.By the soil-free pot experiment,the effects of 6 ni-trogen treatments(100％NH4+-N,50％NO3--N+50％NH4+-N,100％NO3-N,50％NO3-N+50％CO(NH2)2,100％CO(NH2)2,50％NH4+-N+50％CO(NH2)2)on the growth indicators and absorption and distribution of N,P,K,Ca,Mg and Fe in Cucumis sativus L.were studied.The results showed that the dry weight,plant height,protein content and amino acid content was highest in 50％NO3--N+50％CO(NH2)2,while the lowest in 100％NH4+-N treatment.The difference between the maximum value and the value of stem diameter and chlorophyll content in 50％NO3--N+50％CO(NH2)2 treatment was not significant.In the three single nitrogenous fertilizer,100％CO(NH2)2 was more beneficial to the absorption of N,while the effect of N absorption by mixed nitrogen fertilizer was obviously better than that of single nitrogen fertilizer.100％NH4+-N promoted the absorption of P and Fe in cucumber,but inhibit-ed the absorption of K,Ca and Mg.On the contrary,100％NO3--N has adverse effect on the absorption of P and Fe in cucumber,but enhanced the absorption o+K,Ca and Mg significantly.As a result 50％NO3--N+50％CO(NH2)2 and other mixed nitrogen fertilizer could promote the balanced absorption of P,K,Ca,Mg,Fe in cucumber to some extent.By the treatment of 50％NO3-N+50％CO(NH2)2,the accumulation of N and K reached the maxi-mum value.Although the accumulation of Ca was not the maximum with the treatment of 50％NO3-N+50％CO(NH2)2,the difference was not significant with the maximum.While the accumulation of P and Fe were the maxi-mum by the treatment of 50％NH4+-N+50％CO(NH2)2.Correlation analysis found that the change rule of dry wei-ght,protein content and amino acid content was consistent with the accumulation of N,which reached maximum by the treatment of 50％NO3--N+50％CO(NH2)2.There was a significantly positive correlation between dry weight,protein content,amino acid content and the accumulation of N.In conclusion,under the same nitrogen level mixed nitrogen fertilizer was more beneficial to growth,nutrient absorption and utilization of cucumber,and the most appro-priate combination was 50％NO3--N+50％CO(NH2)2.The conclusion provided technical support for the quality im-provement and utilization of nitrogen fertilizer in cucumber production.
Nitrogen fertilizer formsCucumberGrowthNutrient elements
NETL
NSTL
万方数据
维普
