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Ni Nyoman Sulastri
Program Studi Teknik Pertanian dan Biosistem, Fakultas Teknologi Pertanian Universitas Udayana, Badung, Bali
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Pengaruh Lama Penyinaran Led Merah Biru TerhadapPertumbuhan Pakcoy(Brassica RapaL) Gregorius Adelbertus Samur; I Made Anom Sutrisna Wijaya; Ni Nyoman Sulastri
Jurnal BETA (Biosistem dan Teknik Pertanian) Vol 12 No 1 (2024): April
Publisher : Program Studi Teknik Pertanian dan Biosistem, Fakultas Teknologi Pertanian, Universitas Udayana, Badung, Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JBETA.2024.v12.i01.p04

Abstract

Pakcoy (Brassica rapa L.) is an important vegetable in Asia. Red-blue light-emitting diode (LED) illumination can accelerate photosynthesis and influence plant growth. This study aimed to determine the optimal duration of red-blue LED irradiation for pakcoy growth. A completely randomized design (CRD) was used with five irradiation durations: 18, 16, 14, 12, and 10 hours. Observed parameters included plant height, canopy area, number of leaves, chlorophyll content (SPAD value), fresh weight at harvest, biomass, and root length. The results showed that 18 hours of red-blue LED irradiation produced the best growth, with an average plant height of 17.4 cm, 11.5 leaves, chlorophyll content of 43.7 SPAD units, root length of 28 cm, fresh canopy and root weight of 18.25 g and 0.95 g, and trunk and root biomass of 1.21 g and 0.25 g, respectively. In conclusion, prolonged red-blue LED irradiation significantly improves pakcoy growth.
Korelasi Nilai SPAD dengan Intensitas Serangan Penyakit Blas Pada Umur Padi Yang Berbeda I Made Sudiarta; I Made Anom S. Wijaya; Ni Nyoman Sulastri
Jurnal BETA (Biosistem dan Teknik Pertanian) Vol 12 No 1 (2024): April
Publisher : Program Studi Teknik Pertanian dan Biosistem, Fakultas Teknologi Pertanian, Universitas Udayana, Badung, Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/JBETA.2024.v12.i01.p16

Abstract

Rice is an important food crop that serves as the staple food for more than half of the world's population. Rice plant health is crucial in determining crop yields, and chlorophyll content is closely related to plant health, which affects rice production. A decline in plant health makes crops more susceptible to diseases, such as blast disease, which can be observed on the leaves by changes in greenness. SPAD (Soil Plant Analysis Development) is a simple tool used to measure chlorophyll content in plant leaves. This study aimed to (1) determine the relationship between SPAD values and the intensity of blast disease attacks, and (2) obtain a correlation value between SPAD and disease intensity. Data collection was conducted in Medium Village, Badung Regency, from rice aged 71 to 94 days after planting (HST). Measurements were taken diagonally across three rice fields, with five points per plot, nine clumps per point, and SPAD measured in three sections of each leaf (upper, middle, and lower). Disease intensity was determined from the distribution of spots on the leaves. The development of disease intensity and SPAD over time showed that high disease intensity corresponded with low SPAD values, while high SPAD values corresponded with low disease intensity. The results indicated a linear relationship between SPAD and disease intensity, with a correlation value of 0.8634 (86%), indicating a very strong correlation since it exceeds 0.75 (75%).
Co-Authors Gregorius Adelbertus Samur I Made Anom S. Wijaya I Made Anom Sutrisna Wijaya I Made Sudiarta