The Study on the Coupling Effect of Water and Nitrogen on the Flu-cured Tobacco Seedlings at Provisional Planting Stage Based on Partial Least Squares Regression

doi:10.7668/hbnxb.2015.S1.079

Abstract

Abstract: Reasonable water and nitrogen management is a pivotal factor affecting the sound seedling index of the flu-cured tobacco seedlings at provisional planting stage.In order to study the ratio of water and nitrogen for the flu-cured tobacco seedlings at provisional planting stage,this article studied the coupling effect of relative moisture content and nitrogen application amount on the growth of flu-cured tobacco seedlings and got the coupling ratio of water and nitrogen of the flu-cured tobacco seedlings at provisional planting stage using partial least squares regression method.Results showed that both of the relative moisture content and nitrogen application amount significantly affected the growth of flu-cured tobacco seedlings.Specifically,all of the growth factors except of ground biomass showed a tendency of first increased and then decreased along with the rising relative water content of soil.Whereas,the changing patterns of growth factors were not consistent with the rising nitrogen application amount.The two single factors relative water content of soil and nitrogen application amount had dramatic influence on all of growth factors excepted for ground biomass.Whereas,the coupling effect of water and nitrogen had significantly influenced rather on underground fresh weight and ground biomass than other growth factors.The quadratic polynomial equation obtained by matching growth factors of flu-cured tobacco seedlings with relative water content of soil and nitrogen application amount using partial least squares regression method indicated that only the fitting coefficient R² of ground biomass was poor,but other growth factors were high.The coefficient of nitrogen application amount(X₂) in the equation was distinctly higher than that of relative water content of soil(X₁),namely the positive effect of nitrogen application amount on the growth of flu-cured tobacco seedlings was greater than that of relative water content of soil.The optic relative water content of soil was 58.46% and which corresponded to the best growth status of flu-cured tobacco seedlings at provisional planting stage was determined by using the obtained quadratic polynomial equation at the conditions of this study.Well,the optic nitrogen application amount was 1.53 g/kg with an alkali-hydrolyzable nitrogen of culture medium at 0.34 g/kg.

Key words: Flu-cured tobacco seedlings, Growth, Coupling effect of water and nitrogen, Partial least squares regression

CLC Number:

S147.21

HE Guo-qiang, XU Yong-jun, QI Hong-ling, ZHU Fu-guo, LI Hui, QIN Yu-bao, YUAN Ye. The Study on the Coupling Effect of Water and Nitrogen on the Flu-cured Tobacco Seedlings at Provisional Planting Stage Based on Partial Least Squares Regression[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(S1): 435-440. doi: 10.7668/hbnxb.2015.S1.079.

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