Path Analysis of SubstRate Physicochemical PRopeRties and Tomato Plug-seedlings Index

doi:10.7668/hbnxb.2013.06.018

Abstract

Abstract: In this paper, taking peat, perlite and vermiculite as the basic experimental material, established dif-ferent physicochemical properties of compound substrate through the way of different proportion of basic materials.Applied regression analysis and path analysis to study the indicator of substrate physicochemical properties on toma -to plug-seedlings,in order to achieve the standardization of substrate physicochemical properties and screen sub -strate formula of tomato seedlings production.The result indicated that, peat∶perlite∶vermiculite=6∶4∶1 ( V/V) was best for tomato plug seedlings ( Physicochemical properties as follows:Bulk density was 0.113 g/cm³, total porosity was 64.65%,air-filled porosity was 40.22%,container capacity was 24.44%,pH-value was 6.19,EC-value was 0.76 mS/cm,available nitrogen content was 386.9 mg/kg,available phosphorus content was 211.5 mg/kg,availa-ble potassium content was 826.5 mg/kg).Through the comparison of seedling morphological index and quality in-dex, we found that tomato seedling cultivated with peat∶perlite∶vermiculite=6∶4∶1 was significant higher than oth-er substrate formula on stem diameter and strong plug-seedlings index ( G-Value,root-shoot ratio, sound seedlings in-dex ).Regression and path analysis showed that direct path coefficient, positive and negative effects were different a-mong substrate physicochemical properties and tomato strong plug-seedlings index.Bulk density was the main physi-cal properties that influenced tomato strong plug-seedlings index in the production of tomato seedling.When the sub-strate physical property was in the optimum range.pH-value,available nitrogen,available phosphorus and available potassium content were the main factors which effect tomato strong plug-seedlings index.In order to got the best composite substrate formulation and cultivated strong and high-yield tomato seedlings, in the preparation of sub-strate, bulk density was the first consideration, within a suitable range, then adjusted pH value and available nutrient content for the requirements of tomato plug-seedlings.

Key words: Tomato, StRong plug-seedlings index, Compound substRate, Physicochemical pRopeRties, Multiple RegRession, Path analysis

CLC Number:

S641.2

YANG Yan-jie, ZHAO Kang, LIN Duo, CHEN Ning. Path Analysis of SubstRate Physicochemical PRopeRties and Tomato Plug-seedlings Index[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2013, 28(6): 104-110. doi: 10.7668/hbnxb.2013.06.018.

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