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Sains Malaysiana 52(4)(2023):
http://doi.org/10.17576/jsm-2023-5204-04
Influence
of Beneficial Bacterial Inoculation on Nitrogen Concentration and Tomato
Seedling Growth Under Glasshouse Conditions
(Pengaruh Inokulasi
Bakteria Bermanfaat terhadap Kepekatan Nitrogen dan Pertumbuhan Anak Benih
Tomato di bawah Keadaan Rumah Kaca)
AMAILY AKTER1, ALI TAN KEE ZUAN1*,
SUSILAWATI BINTI KASIM1, ADIBAH BINTI MOHD AMIN1, ZAKRY
FITRI BIN AB AZIZ2, NOOR MD RAHMATULLAH3, MD EKHLASUR RAHMAN1,4,
BURAQ MUSA SADEQ1 & SAYMA SERINE CHOMPA1
1Department of Land Management,
Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor
Darul Ehsan, Malaysia
2Faculty of Agriculture and Food
Sciences, Universiti Putra Malaysia Bintulu Campus,
3Department of Agricultural
Statistics, Faculty of Agribusiness Management, Sher-e-Bangla
Agricultural University, Dhaka-1207, Bangladesh
4Divisional Laboratory, Soil
Resource Development Institute, Krishi Khamar Sarak, Farmgate, Dhaka-1215,
Bangladesh
Received: 8 August 2022/Accepted:
17 February 2023
Abstract
Many
types of soil bacteria through antagonistic activity, thrive in the rhizosphere
of plants or surround the tissues of plants and encourage plant development and
reduce the nematode population. Bacteria as such are commonly known as Plant
Growth-Promoting Rhizobacteria (PGPR). The purpose of this research was to
determine Bacillus spp. inoculations impact on tomato seedling development with varying rates of
chemical nitrogen-fertilizer. To minimize the recommended quantity of N
fertilizer for tomato seedling development, a small pot experiment with
selected PGPB was undertaken with varying amount of N fertilizer. Plant growth-promoting bacteria (PGPB) labeled
as UPMB10 and UPMRB9 (identified as Bacillus subtilis and Bacillus
tequilensis, respectively) were utilized as microbial inoculants because
they showed a significant improvement in seedling growth and N concentration in
tomato plant tissues in a pot culture investigation. These microbial inoculants
significantly improved the development of the plants, stem length, root length,
leaves number, dry weight of shoots (stem, leaves), dry weight of roots, SPAD
value, N concentration in tissues, and soil bacterial population.
Bacteria-treated seedlings with 50% N fertilizer significantly increased stem
length (69.07%), root length (78.51%), leaves number (68.58%),
shoots (92.45%, 90.39%, stem and leaves, respectively), roots (73.33%), SPAD
value (50.31%), and N concentration in plant tissues (63.79%) as compared to
the uninoculated control. The
findings also showed that inoculation of the Bacillus spp. tomato seedlings could save up
to 50 percent of the recommended rate of chemical N fertilizer without
affecting tomato seedling growth. The findings of this study suggest that the
amount of nitrogen fertilizer given during tomato seedling development can be
reduced by half, resulting in increased soil health and reduced environmental
pollution.
Keywords:
Inoculation; N levels; plant growth-promoting bacteria; tomato
Abstrak
Pelbagai
jenis bakteria tanah melalui aktiviti antagonis, tumbuh subur dalam rizosfera
tumbuhan atau mengelilingi tisu tumbuhan dan menggalakkan perkembangan tumbuhan
dan mengurangkan populasi nematod. Bakteria seperti ini biasanya dikenali sebagai
Rizobakteria Penggalak Pertumbuhan Tumbuhan (PGPR). Tujuan
penyelidikan ini adalah untuk menentukan impak inokulasi Bacillus spp. kepada
perkembangan anak benih tomato dengan kadar baja nitrogen kimia yang
berbeza-beza. Untuk meminimumkan kuantiti baja N yang disyorkan untuk
pembangunan anak benih tomato, satu uji kaji pasu kecil dengan PGPB terpilih
telah dijalankan dengan jumlah baja N yang berbeza-beza. Bakteria
penggalak pertumbuhan tumbuhan (PGPB) yang dilabelkan sebagai UPMB10 dan UPMRB9
(masing-masing dikenal pasti sebagai Bacillus
subtilis dan Bacillus tequilensis)
telah digunakan sebagai inokulan mikrob kerana ia menunjukkan peningkatan yang
ketara dalam pertumbuhan anak benih dan kepekatan N dalam tisu tumbuhan tomato
kajian kultur pasu. Inokulan mikrob ini dengan ketara meningkatkan
perkembangan tumbuhan, panjang batang, panjang akar, bilangan daun, berat
kering pucuk (batang, daun), berat kering akar, nilai SPAD, kepekatan N dalam
tisu dan populasi bakteria tanah. Anak benih yang dirawat dengan 50% N bakteria baja dengan
ketara meningkatkan panjang batang (69.07%), panjang akar (78.51%), bilangan
daun (68.58%), pucuk (masing-masing 92.45%, 90.39% untuk batang dan daun), akar
(73.33%), nilai SPAD (50.31%) dan kepekatan N dalam tisu tumbuhan (63.79%)
berbanding kawalan tanpa inokulasi. Hasil kajian juga menunjukkan bahawa inokulasi Bacillus spp. anak benih
tomato boleh menjimatkan sehingga 50 peratus daripada kadar baja N kimia yang
disyorkan tanpa menjejaskan pertumbuhan anak benih tomato. Hasil kajian
ini juga mencadangkan bahawa jumlah baja nitrogen yang diberikan semasa
pembangunan anak benih tomato dapat dikurangkan sebanyak separuh, menyebabkan
kesihatan tanah meningkat dan pencemaran alam sekitar berkurangan.
Kata
kunci: Bakteria penggalak pertumbuhan tumbuhan; inokulasi; tahap N; tomato
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*Corresponding author; email: tkz@upm.edu.my
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