Tag Archives: vegetative growth

1519-1540 F.E. Omari, L. Beniken, A. Zouahri, R. Mrabet, H. Benaouda, R. Benkirane and H. Benyahia
Optimization of NPK levels of Clementine Sidi Aissa (Citrus reticulata Blanco) trees grafted on different citrus rootstocks
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Optimization of NPK levels of Clementine Sidi Aissa (Citrus reticulata Blanco) trees grafted on different citrus rootstocks

F.E. Omari¹, L. Beniken¹, A. Zouahri², R. Mrabet³, H. Benaouda¹, R. Benkirane⁴ and H. Benyahia¹

¹Regional Center of Agricultural Research of Kenitra, National Institute of Agricultural Research (INRA), N°14, Ave. Abou Temmam mailbox: 257. Kenitra, Morocco
²Regional Center of Agricultural Research of Rabat, National Institute of Agricultural Research (INRA), Ave. Mohamed Belarbi Alaoui mailbox: 6356 – Institutes, Rabat Morocco
³National Institute of Agricultural Research (INRA), Rabat- Morocco. Ave. Ennasr mailbox: 415 RP Rabat Morocco
⁴Plant Productions, Animal and Agro-Industry Laboratory, Ibn Tofail University, Faculty of Science of Kenitra, University Campus, mailbox 133 Kenitra, Morocoo
*Correspondence: fatimaezahra.omari@inra.ma

Abstract:

The present study aims to investigate the impact of various nitrogen concentrations on young Clementine Sidi Aissa citrus trees (Citrus reticulata Blanco), grafted on five citrus rootstocks namely Moroccan Carrizo citrange, French Carrizo citrange, Troyer citrange, Citrus macrophylla, and sour orange (Citrus aurantium L.). The experiment took place in greenhouses at the Experimental station of El Menzeh INRA-Morocco, with the young trees grown in containers. We applied five different nitrogen treatments (expressed as mg L-1 of N-P2O5-K2O): (0–0–0), (0–25–50), (25–25–50), (50–25–50), and (100–25–50). The split-plot experimental design was used with three replications.

The findings demonstrate that the nitrogen enrichment resulted in enhanced plant growth, marked by increased plant height, rootstock and scion stem diameters, diameter and shoot length, relative water content (RWC), as well as leaf chlorophyll and proline content. Optimal growth of the Clementine Sidi Aissa trees was observed under the 100–25–50 (mg L-1 of N-P2O5-K2O) treatment.

The study also found that leaf nitrogen concentration increased in line with the quantity of nitrogen added, whereas the percentages of phosphorous and potassium in the leaves decreased. The most significant growth increase across the majority of the studied parameters was noted in Clementine Sidi Aissa trees grafted on Moroccan Carrizo citrange and Troyer citrange rootstocks.

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2742–2751 V. Laugale, S. Dane, S. Strautiņa and I. Kalniņa
Influence of vermicompost on strawberry plant growth and dehydrogenase activity in soil
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Influence of vermicompost on strawberry plant growth and dehydrogenase activity in soil

V. Laugale*, S. Dane, S. Strautiņa and I. Kalniņa

Institute of Horticulture (LatHort), Graudu iela 1, LV-3124 Dobele, Latvia

Abstract:

Vermicompost is increasingly becoming popular as an organic fertiliser used for different crops. Effects of vermicompost on strawberry plant growth and soil properties were studied in this investigation. The research was performed in LatHort from 2015 to 2017. Strawberry was grown on open field in rows. Two trials were established. In Trial 1, the application of vermicompost with a dose of 50 mL per plant was compared to growing without any fertilization. In Trial 2, several treatments were used: 1) only inorganic mineral fertilization applied; 2) vermicompost applied with a dose of 100 mL per plant in planting holes, later mineral fertilization applied; 3) vermicompost applied with a dose of 100 mL per plant in planting holes, no additional fertilization applied; 4) vermicompost applied two times per season on the ground around plants with dose of 50 mL per plant, no mineral fertilization applied. The plant growth was assessed two times per season by evaluating the amount of leaves and plant height. Soil dehydrogenase activity was evaluated during all growing seasons as indicator of soil microbial activity. The application of vermicompost positively influenced plant growth in comparison to growing without fertilization. In Trial 2, plant growth varied among years. During first two growing seasons better plant growth was observed for plants fertilized by inorganic mineral fertilizers, while later the growth levelled off for all treatments applied. The application of vermicompost had positive influence on the soil dehydrogenase activity in contrary to fertilization by mineral fertilizers.

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511-516 D. Kviklys, J. Lanauskas, J. Sakalauskaitė, N. Kviklienė and N. Uselis
Soil exhaustion and rootstock effect on the growth of apple planting material
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Soil exhaustion and rootstock effect on the growth of apple planting material

D. Kviklys, J. Lanauskas, J. Sakalauskaitė, N. Kviklienė and N. Uselis

Lithuanian Institute of Horticulture, Kauno 30, LT–54333 Babtai, Kaunas distr., Lithuania,e-mail: d.kviklys@lsdi.lt

Abstract:

Apple rootstocks P 59, P 22, P 2, P 60, M.9, M.26, MM.106, B.118 (54–118), B.396 (62–396) and ‘Antonowka‘ seedlings were tested at the Lithuanian Institute of Horticulture in fresh soil and in soil previously used for an apple nursery. Replanting had a negative effect on the development of apple tree propagation material in the nursery. Bud survival of cv. ‘Sampion’ decreased by 24% compared to those in fresh soil. Other tree growth parameters were suppressed as well: tree height by 29%, trunk diameter by 24%, average leaf area by 28%, and absolutely dry leaf weight by 33%. Combining all parameters it could be concluded that apple trees of cv. ‘Sampion’ on P 59 and P 60 rootstocks are the most sensitive to soil exhaustion, whereas trees on P 2 and B.396 rootstocks show tolerance to replanting.

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