Impacts upon cultural techniques on root system development and consequences on durum yields. Proposal of mathematical models for yield assessment

D. Bentahar, M. Amara, M.A. Feddal


Abstract: This work is the main part of a research program entitled: issue of simplified cultural techniques introduction in Algeria. The purpose was to analyse effects of tillage and direct sowing on evolution of soil structure and consequences on root development and on durum yield. And establish a mathematical model which allows quantifying yield in relationship with physical and mechanical parameters of the soil and to different factors linked to cultivation. Results of different tests showed clearly that the used technique has a certain effect on moisture development, porosity and soil penetrometer resistance. Water content in the soil is better stored with direct seeding. Porosity is more important with direct seeding. As for soil penetrometer resistance, soil is more resistant on plot with direct seeding. The penetrometer resistance is also highly conditioned by water content. Results obtained show that the root system is more developed on worked plots with the conventional method than on those worked in direct seeding. Quality of grains is better at level of plots conventionally worked, which present the best root development, the best porosity and penetrometer resistance favourable resistance test. Therefore, the best yields are recorded at level of the conventional technique with the second dose of seeding. The yield modelling in relation with different parameters studied, gives us the following relationship which remain valid in our tests conditions.

- Conventional technique :=565,42. 

-Direct seeding: 482,47

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