Tag Archives: biostimulant

410-422 N. Yuniati, Kusumiyati, S. Mubarok and B. Nurhadi
Germination performance and seedling characteristics of chili pepper after seed priming with leaf extract of Moringa oleifera
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Germination performance and seedling characteristics of chili pepper after seed priming with leaf extract of Moringa oleifera

N. Yuniati¹*, Kusumiyati¹, S. Mubarok¹ and B. Nurhadi²

¹Universitas Padjadjaran, Faculty of Agriculture, Jalan Raya Bandung-Sumedang KM 21, Sumedang 45363, Indonesia
²Universitas Padjadjaran, Faculty of Agro-industrial Technology, Jalan Raya Bandung-Sumedang KM 21, Sumedang 45363, Indonesia
*Correspondence: nita13007@mail.unpad.ac.id

Abstract:

Germination is the most critical stage of the plant life cycle since it is a principal component of seedling establishment and survival. The germination of chili pepper (Capsicum annuum) seeds is typically slow and non-uniform under favorable and unfavorable conditions. To overcome these problems, seed priming with moringa leaf extract is a viable option. The objective of this study was to investigate the effect of moringa leaf extract priming on germination performance and seedling characteristics of chili pepper. A completely randomized design was applied with five replications. Different concentrations of moringa leaf extract (1:30, 1:20, and 1:10) as priming solution were evaluated along with priming with distilled water (hydro priming), whereas non-primed seed was taken as control. The results revealed that hydro priming and moringa leaf extract priming effectively increased final germination percentage, germination rate index, germination index, vigor index, shoot length, and decreasing mean germination time. Conversely, the treatments had no significant effect on root length, while moringa leaf extract-primed seeds significantly increased shoot fresh weight. Furthermore, priming with moringa leaf extract at 1:20 had slightly better results than hydro priming, since it yielded higher germination index (363.60) and germination rate index (13.74), although it was at par with other concentrations. Additionally, it significantly produced the highest root fresh weight (13.56 mg) and lower coefficient of variation of germination time (14.61) than the control. Based on these findings, priming with moringa leaf extract in amount of 1:20 can be suggested for improving germination and seedling growth of chili pepper.

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496–506 I.V. Knyazeva, O.V. Vershinina, V.V. Gudimo, A.A. Grishin and A.S. Dorokhov
The effect of succinic acid on the productivity of Lactuca sativa L. in artificial agroecosystems
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The effect of succinic acid on the productivity of Lactuca sativa L. in artificial agroecosystems

I.V. Knyazeva*, O.V. Vershinina, V.V. Gudimo, A.A. Grishin and A.S. Dorokhov

Federal State Scientific Institution «Federal Scientific Agroengineering Center VIM», Department of Closed Artificial Agroecosystems for Crop Science, 1st Institutskiy proezd, 5, RU109428, Moscow, Russia
*Correspondence: knyazewa.inna@yandex.ru

Abstract:

The research of the effect of the biostimulant on the growth and development of plants of the ‘Robin’ lettuce variety was carried out in 2019–2020 in the department of closed artificial agroecosystems for crop production on the basis of the Federal State Budgetary Scientific Institution «Federal Scientific Agroengineering Center VIM», Moscow (VIM, Russia). Succinic acid was used at the stage of inoculation of seed and with constant drip irrigation of plants throughout the growing period. Lettuce plants were grown using a low-volume technology in a climatic chamber produced by VIM (Russia). According to the studies carried out, inoculation of seeds stimulates the development of plants at the initial stages, reducing the period from sowing to germination and increasing the rate of plant growth. As the lettuce plants grew, the leaf surface area increased from 221.0 to 1511.9 cm² with the addition of succinic acid to the hydroponic nutrient solution. The use of succinic acid under controlled growing conditions of ‘Robin’ lettuce plants allowed to increase the performance of the leaf apparatus in relation to the control. It was experimentally established that productivity directly depended on the value of photosynthetic potential and net productivity of photosynthesis, which is confirmed by a strong degree of dependence with a correlation coefficient of 0.98 and 0.77, respectively. Seed treatment and adding succinic acid to the hydroponic solution increases the accumulation of dry matter in lettuce plants. With this method of using succinic acid, significant differences in the accumulation of dry mass of plants were established. The share of the effect of the factor of inoculation of seeds with succinic acid was 17.5%, the addition of hydroponics to the nutrient solution was 50.1%. The use of succinic acid increases the accumulation of plant biomass, increases the total leaf surface area, and also contributes to an increase in the parameters of photosynthetic activity of the leaf apparatus of the ‘Robin’ lettuce plants under controlled conditions of the climatic chamber.

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