Effect of the Application of Microorganisms on the Nutrient Absorption in Avocado (Persea americana Mill.) Seedlings

국문 초록 (Abstract)

아보카도는 에콰도르에서 경제적으로 중요한 과수이다. 건강한 종묘 생산은 아보카도 식물의 생산에서 중요한 단계이며 유익한 미생물의 처리는 식물체의 영양을 향상 시키는데 사용 될 수 있다. 아보카도 묘목에 처리한 미생물의 효과를 검정한 결과, 묘목의 뿌리부분과 지상부의 양분 흡수를 증가시켰다. T. harzianum은 뿌리에서 N과 Mg의 흡수를 유의적으로 증가시켰으며, 지상부에서는 N, Ca, Mg, Mn 및 Cu의 흡수를 증가시켰다. 반면에, G. iranicum var tenuihypharum은 뿌리에서 Ca와 Fe의 흡수를 유의적으로 증가시켰으며, 지상부에서는 N흡수를 증가시켰다. 또한, mycorrhiza의 접종으로 아보카도 묘목의 뿌리 부분과 지상부에서 P 양을 증가시키는 경향이 긍정적으로 나타났다. 두 미생물 모두 S의 흡수에 영향을 미치지 않았는데, 이는 식물 전체에서 균일한 비율을 나타냈다. 또한 인산질 비료(일인산 칼륨)의 시용은 미량 영양소의 흡수에 긍정적인 영향을 미쳤다.

다국어 초록 (Multilingual Abstract)

Avocado is a fruit crop of high economic importance for Ecuador, both locally and for exportation. Fuerte and Hass varieties are cultivated, both of which are grafted onto rootstocks from the cultivar Criollo. The growth of rootstocks in the nursery is a critical stage in the production of avocado plants, and application of beneficial microorganisms could be used to improve plant nutrition and growth of the rootstocks. In this research, the effect of inoculation of Trichoderma harzianum or Glomus iranicum var. tenuihypharum on avocado rootstock seedlings (cultivar Criollo) was evaluated. Application of T. harzianum significantly increased the absorption of N5+ and Mg2+ in the roots; while in the aerial parts (leaves and stem), it increased the absorption of N5+, Ca2+, Mg2+, Mn2+ and Cu2+. On the other hand, G. iranicum var. tenuihypharum significantly increased the absorption of Ca2+ and Fe3+ in the root; but no major effect was observed in the aerial part. However, a positive tendency toward an increase in the amount of P5+ was observed in the root; while in the aerial part this trend was observed for N3- and Ca2+ absorption. Neither of the two microorganisms influenced the absorption of S4+, an element that was present at stable levels in the whole plant. In conclusion, the applied microorganisms produced an increase in absorption of several macro and micronutrient in Criollo avocado rootstock seedlings.

목차 (Table of Contents)

• ABSTRACT
• INTRODUCTION
• MATERIALS AND METHODS
• Location of the experiment.
• Vegetal material.
• Inoculation of the mycorrhizal fungus.
• Inoculation of Trichoderma.
• Application of the phosphorus source.
• Macro and micronutrient analysis.
• RESULTS AND DISCUSSION
• 1. Root of avocado seedling
• 적 요
• REFERENCES