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Sirvi Autor "Ria, R.P." järgi

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  • Pisipilt
    Kirje
    Drought stress and selective manure on the growth and yield of Chaya (Cnidoscolus aconitifolius) in a tropical climate
    (Estonian University of Life Sciences, 2025) Gustiar, F.; Susilawati; Pratama, F.; Widjajanto, D.W.; Ria, R.P.; Muda, S.A.; Setyawan, L.A.P.
    Chaya (Cnidoscolus aconitifolius) is a nutrient-dense, perennial leafy vegetable with great potential to support food security, especially in tropical regions. As a drought-tolerant plant, chaya is suitable for cultivation under changing climate conditions, including prolonged dry seasons. However, limited research has examined its specific response to varying levels of drought stress and organic fertilizer application. This study aimed to assess the growth and yield response of chaya under different irrigation volumes and manure types. The experiment was conducted from June to September 2024 in the greenhouse of the Faculty of Agriculture, Sriwijaya University, using a factorial randomized block design with two factors: irrigation volume (250 mL, 500 mL, 750 mL per two days) and manure type (no manure, chicken manure, and goat manure). Each treatment combination was replicated three times. Results showed that severe drought stress (250 mL) significantly inhibited plant growth, particularly in terms of shoot length and leaf area. Chicken manure improved soil moisture retention, maintaining levels up to 25% under drought conditions. In contrast, goat manure was more effective in supporting plant growth and yield under limited water availability. These findings suggest that combining appropriate organic amendments with optimized irrigation can enhance the resilience of chaya cultivation in tropical dryland environments.
  • Pisipilt
    Kirje
    The impact of straw application on growth dynamics and proline accumulation in drought-stressed rice
    (Estonian University of Life Sciences, 2025) Ria, R.P.; Kartika, K.; Lakitan, B.; Sulaiman, F.; Meihana, M.
    The frequent occurrence of unpredictable extreme droughts necessitates investigating measures to mitigate their impacts, as drought may occur at any growth phase of rice. This study evaluated the efficiency of straw applications to conserve soil moisture and mitigate the negative effect of drought stress on rice in tropical riparian wetlands. Rice straw was applied as organic matter (S1) and as mulch (S2) and then subjected to drought stress during early vegetative (D1), late vegetative (D2), and generative (D3) phases. The result of this study showed that the utilization of straw slowed down the water loss through evaporation as indicated by soil moisture. However, both rice straw applications, organic matter and mulch, were inefficient in maintaining the optimum plant growth when the soil moisture declined to < 10%. Drought stress at the early vegetative phase reduced the number of leaves by 63.68%, the number of tillers by 50.58%, and the total leaf area by 72.36%. Drought stress at the early vegetative phase also delayed flowering time for 11 days. Meanwhile, drought stress during the generative phase reduced the number of filled spikelets by 45.18% and increased sterile spikelets to 247.05%, which significantly reduced the yield. Plants that experienced drought stress during the vegetative and generative phases eventually increased the proline content by about 10 times (18.47 mmol g-1) compared to unstressed plants (1.62 mmol g-1). Straw mulching is recommended for mild to moderate droughts, but additional methods are needed to maintain soil moisture below 10%.