Morfologi Akar Tanaman Jagung (Zea mays L.), Serapan Hara N, P, dan K Akibat Pemberian Beberapa Jenis Biochar  pada Tanah Bekas Galian Tambang

Bamboo chips, palm shells, and rice husks waste are environmental pollutants, but have the potential to be processed by pyrolysis to become biochar. Biochar is organic products rich in carbon, high in micro pores and very suitable for amending degraded (damaged) lands. Quality of biohar to be used as a soil amendment is highly dependent on is the raw material (feedstocks) to make biochar itself. The research objective was to find out the most suitable type of biochar to be used as a soil amendment for ex-mining land, so that the growth and production of plants can be optimum. The research has been carried out in the experimental station of the Syiah Kuala University Banda Aceh from August to December 2019 using soil from ex-excavated coal mines of PT. Mifa in West Aceh, Aceh Province. The plant parameters studied were morphological parameters of plant roots (length, weight, specific root length and ratio of roots to plant shoot), nutrient uptake of N, P, and K planted on ex-mine excavated soil. The study was designed using a non-factorial randomized block design consisting of two observation treatment factors, namely the type of biochar treatment (bamboo, palm shell, rice husk) and the dose of biochar (0, 10, 20 ton ha-1), and repeated 3 times. The observations that were observed included the components of root morphology and nutrient uptake of N, P and K plants. Biochar characteristics were analyzed using a Scanning Electron Microscope (SEM). Chemical-physical analyses of soil and plants were based on the procedure issued by the Soil Research Institute, Bogor. The effect among treatments was carried out by a variance analyses test (ANOVA) and if there was an effect, the honestly difference test (Tuckey-HSD) was continued at the level of 0.05. The results showed that the type of biochar had a significant effect on root morphology and nutrient uptake of N, P and K plants. Application biochar of rice husk with the amount of 20 tons ha-1 showed the best treatment for all the parameters studied, this is because nitrogen content in rice husk biochar contribute to growing corn crop. This study also found that bamboo biochar and palm shells gave a negative response when the amount of administration was increased to 20 tonnes ha-1 except for rice husk biochar.

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PENGARUH APLIKASI BIOCHAR SEKAM PADI DAN KOMPOS TERHADAP SIFAT KIMIA TANAH, PERTUMBUHAN, DAN SERAPAN FOSFOR TANAMAN JAGUNG PADA ULTISOL

Jurnal Tanah dan Sumberdaya Lahan ◽

10.21776/ub.jtsl.2021.008.2.10 ◽

2021 ◽

Vol 8 (2) ◽

pp. 385-394

Author(s):

Diva Ariella Herhandini ◽

Retno Suntari ◽

Ania Citraresmini

Keyword(s):

Organic Carbon ◽

Rice Husk ◽

Block Design ◽

Chemical Properties ◽

P Uptake ◽

Soil Chemical Properties ◽

Available P ◽

Maize Crop ◽

Randomized Block Design ◽

Rice Husk Biochar

Rice husk biochar and compost application are expected to improve soil chemical properties such as pH, organic carbon, and available P in Ultisol, which in turn improves crop growth and P uptake by plants. The purpose of this research was to analyze the effect of the combination of rice husk biochar and compost on the soil chemical properties (pH, organic carbon, and available P), maize growth, and P uptake by maize in an Ultisol. The research used a Randomized Block Design with six treatments (P0: control; P1: 4 t biochar ha-1; P2: 30 t compost ha-1; P3: 4 t biochar ha-1 and 30 t compost ha-1; P4: 8 t biochar ha-1 and 30 t compost ha-1; P5: 4 t biochar ha-1 and 60 t compost ha-1) and four replications. The result showed that the combination of 8 t rice husk biochar ha-1 and 30 t compost ha-1 showed a significant effect on increasing pH, organic carbon, and available P in an Ultisol, increasing the height of maize crops at 4 and 6 WAP (weeks after planting). However, it had no effect on the number of leaves and showed an effect on the increase in P uptake of maize crop.

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Benefits of Biochar Compost (BIOCHOM) to Yield Rice Productivity on Tropical Swampland, South Kalimantan, Indonesia

BIO Web of Conferences ◽

10.1051/bioconf/20202001009 ◽

2020 ◽

Vol 20 ◽

pp. 01009

Author(s):

Wahida Annisa ◽

Evy Setiawati

Keyword(s):

Rice Husk ◽

Rice Yield ◽

Global Climate ◽

Block Design ◽

Positive Outcomes ◽

Soil Function ◽

Randomized Block Design ◽

Rice Yields ◽

Rice Husk Biochar ◽

The Impact

Biochar improves soil quality physicochemical. Biochar is a soil amendment created through the burning of biomass, has a potential solution for wide-ranging environmental management problems. Biochar has been shown to have positive outcomes on soil function to sequester carbon to slow the effects of global climate change. The objective of this research was to study the impact of compost biochar in increasing rice yields in tropical swampland. The design used in this study was a randomized block design, including (1) biochom 1 (without harvest waste compost + without biochar rice husk), (2) Biochom 2 (harvest waste compost 5 t/ha), (3) biochom 3 (rice husk biochar 5 t/ha), (4) biochom 4 (a combination of harvest waste compost 2.5 t/ ha + rice husk biochar 2.5 t/ha). The results showed that application of biochom 4 (a combination of harvest waste compost 2.5 t/ha + rice husk biochar 2.5 t/ha) increased of rice yield reached 15.21% compared to biochom 2 treatment (compost harvest waste 5 t/ha) and reached 17.78% with biochom 3 treatment (rice husk biochar 5 t/ha), compost without biochar treatment.

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Pengaruh Jumlah Ruas Stek pada Beberapa Jenis Media Tanam terhadap Pertumbuhan Tanaman Nilam (Pogostemon cablin Benth.) pada Fase Pembibitan

Jurnal Ilmiah Mahasiswa Pertanian ◽

10.17969/jimfp.v4i2.11020 ◽

2020 ◽

Vol 4 (2) ◽

pp. 131-140

Author(s):

Mailiani Mailiani ◽

Agus Halim S. ◽

Erita Hayati ◽

Erita Hayati

Keyword(s):

Plant Height ◽

Rice Husk ◽

Block Design ◽

Shoot Length ◽

Water Lettuce ◽

Randomized Block Design ◽

Pogostemon Cablin ◽

Height Increase ◽

Rice Husk Biochar ◽

Banda Aceh

Abstrak. Tujuan dari penelitian ini yaitu untuk mengetahui pengaruh jumlah ruas stek, jenis media tanam dan interaksi jumlah ruas stek dan jenis media tanam terhadap pertumbuhan tanaman nilam. Penelitian ini dilaksanakan di Kebun Percobaan Fakultas Pertanian Universitas Syiah Kuala Darussalam Banda Aceh dari bulan Juni hingga Agustus 2018. Analisis data yang digunakan dalam penelitian ini adalah Rancangan Acak Kelompok (RAK) pola faktorial 3 x 4 dengan 3 ulangan.Faktor yang diamati dalam penelitian ini yaitu jumlah ruas stek dan jenis media tanam. Jumlah ruas stek yang digunakan adalah jumlah stek 4 ruas, 5 ruas dan 6 ruas serta jenis media tanam yang digunakan adalah media tanam kontrol, media tanam campuran biochar sekam padi, media tanam campuran eceng gondok dan media tanam campuran water lettuce. Parameter yang diamati yaitu : pertambahan tinggi tanaman, jumlah daun, jumlah tunas, panjang tunas dan volume akar. Hasil penelitian ini menunjukkan jumlah ruas stek berpengaruh nyata terhadap panjang tunas serta berpengaruh sangat nyata pada volume akar. Jumlah ruas stek terbaik terdapat pada 4 jumlah ruas stek. Jenis media tanam berpengaruh sangat nyata terhadap pertambahan tinggi tanaman 30 dan 60 HST, jumlah daun 30 dan 60 HST, jumlah tunas 90 HST, panjang tunas 90 HST dan volume akar HST serta berpengaruh nyata terhadap jumlah daun 90 HST. Jenis media tanam terbaik terdapat pada media tanam campuran biochar sekam padi. Interaksiantara jumlah ruas stek dan jenis media tanam berpengaruh nyata pada pertambahan tinggi tanaman 90 HST serta berpengaruh sangat nyata terhadap volume akar 90 HST. Interaksiantara jumlah ruas stek dan jenis media tanam terbaik terdapat pada jumlah ruas stek(4 ruas) dan jenis media tanam campuran (tanah, pupuk kandang dan biochar sekam padi).The effect of Cutting Interonode Numbers and Types of Planting Media on The Growth of Patchouli Plant in Seedling StageAbstrak. This research aims to determine the effect of cutting internode numbers, types of planting media and interaction of cutting internode numbers and types of planting media on the growth of the patchouli plant. This research carried out at the experimental garden of agriculture faculty, Syiah Kuala University, Darussalam, Banda Aceh from Juni to Agustus 2018. The data analysis that used in this research was Randomized Block Design-Factorial 3x4 with 3 replications. The observed factors in this research were cutting internode numbers and types of planting media. The first factor was cutting internode numbers: 4 cutting internode, 5 cutting internode and 6 cutting internode. The second factor was types of planting media: planting media control, mixture planting media of rice husk biochar, mixture planting media of water hyacinth mixture planting media of and water lettuce. The parameters that are observed: plant height increase, leaf numbers, shoot numbers, shoot length, and volume of roots. This result of this research showed that cutting internode numbers were significant on shoot length and very significant in a volume of roots. 4 internode number of cutting showed the best result in the growth of the patchouli plant. Types of planting media were very significant in plant height increase 30 and 60 DAP, leaf numbers 30 and 60 DAP, shoot numbers 90 DAP, shoot length 90 DAP and volume of roots and were significant in leaf numbers 90 DAP. The interaction of cutting internode numbers and types of planting media were significant in plant height increase 90 DAP and very significant in the volume of roots 90 HST. 4 internode numbers of cutting and type of mixture planting media (soil, manure, and rice husk biochar) showed the best result on the growth of patchouli plants.

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Pengaruh Media Tumbuh Biochar Sekam Padi Terhadap Pertumbuhan Bibit Kelapa Sawit

Buletin Palma ◽

10.21082/bp.v16n2.2015.195-202 ◽

2016 ◽

Vol 16 (2) ◽

pp. 195

Author(s):

BASRI A B ◽

. CHAIRUNNAS ◽

ABDUL AZIS

Keyword(s):

Rice Husk ◽

Oil Palm ◽

Organic Material ◽

Block Design ◽

Growth Media ◽

Font Size ◽

Black Line ◽

Randomized Block Design ◽

Growing Medium ◽

Rice Husk Biochar

ABSTRAK Bibit kelapa sawit yang baik salah satunya ditentukan oleh media tumbuh. Penggunaan kompos ataupun pupuk kandang sering berhasil memperbaiki produktivitas tanah dan mensuplai unsur hara ke tanaman. Namun, keuntungan pembenah tanah seperti ini bersifat jangka pendek, terutama di daerah tropis, karena dekomposisi bahan organik yang diberikan berlangsung cepat dan biasanya mengalami mineralisasi menjadi CO2. Karbon hitam (C), yang disebut sebagai biochar dapat mengatasi beberapa keterbatasan suplai bahan organik. Penelitian ini bertujuan untuk mendapatkan komposisi media tumbuh biochar yang sesuai untuk pertumbuhan bibit kelapa sawit. Penelitian menggunakan Rancangan Acak Kelompok dengan 10 perlakuan dan tiga ulangan. Perlakuan yang diuji adalah (1) Topsoil 100%, (2) Biochar sekam padi 100%, (3) Topsoil 50% + biochar sekam padi 50%, (4) Topsoil 50% + kompos 50%, (5) Topsoil 66,6% + biochar sekam padi 33,4%, (6) Topsoil 66,6% + kompos 33,4%, (7) Topsoil 33,3% + biochar sekam padi 33,3% + kompos 33,4%, (8) Topsoil 50% + biochar sekam padi 25% + kompos 25%, (9) Topsoil 40% + biochar sekam padi 40% + kompos 20%, (10) Topsoil 25%+ biochar sekam padi 50% + kompos 25%. Hasil penelitian menunjukkan bahwa pertumbuhan bibit kelapa sawit yang terbaik diperoleh pada media tumbuh campuran topsoil 40%+ biochar sekam padi 40% + kompos 20%.Kata kunci : Pembibitan kelapa sawit, biochar sekam padi, media tumbuh. <span style="color: black; line-height: 115%; letter-spacing: -0.35pt; font-family: 'Arial Bold'; font-size: 14pt; mso-bidi-font-family: 'Arial Bold'; mso-font-width: 95%; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: IN; mso-fareast-language: IN; mso-bidi-language: AR-SA;">The Effect of Biochar Medium on Oil Palm Seedling Growth ABSTRACT Good oil palm seedlings among otyher thing determined by the growing medium. The use of compost or manure often managed to improve productivity, supply nutrient to the palm. But the advantage of using compost or manure to improve soil fertility are share term, especially in the tropic, because decomposition of organic material and usually under go CO2. Black carbon is called biochar can over come some of the limititations of the supply of organic. The research aims to obtain the composition of biochar growth media which suitable for growing of oil palm seedlings. The research was designed by using Randomized Block Design with 10 growth media treatments and 3 replications. The treatments were tested consist of (1) Topsoil 100%, (2) Rice husk biochar 100%, (3) Topsoil 50% + rice husk biochar 50%, (4) Topsoil 50% + compost 50%, (5) Topsoil 66,6% + rice husk biochar 33,4%, (6) Topsoil 66,6% + compost33,4%, (7) Topsoil 33,3% + rice husk biochar 33,3% + compost33,4%, (8) Topsoil 50% + rice husk biochar 25% + compost 25%, (9) Topsoil 40% + rice husk biochar 40% + compost 20%, (10) Topsoil 25% + rice husk biochar 50% + compost 25%. Result indicated that the best growth of oil palm seedlings was obtained on media topsoil 40% + rice husk biochar 40% + compost 20%.Keywords: Oil palm nursery, rice husk biochar, growth media.

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Effects of rice husk biochar and raised bed on CO2 flux and shallot (Allium cepa L.) production on peatland

Sains Tanah - Journal of Soil Science and Agroclimatology ◽

10.20961/stjssa.v18i2.47974 ◽

2021 ◽

Vol 18 (2) ◽

pp. 159

Author(s):

Eka Widiawati Wijaya Kusuma ◽

Azwar Maas ◽

Sri Nuryani Hidayah Utami ◽

Eni Maftuah

Keyword(s):

Rice Husk ◽

Agricultural Research ◽

Block Design ◽

Co2 Flux ◽

Chicken Manure ◽

Randomized Block Design ◽

Allium Cepa L ◽

Raised Bed ◽

Rice Husk Biochar ◽

Research Institute

This study aims to assess the effect of rice husk biochar, raised beds, and chicken manure on the CO2 flux and shallot production on peatland. This study adopted a factorial randomized block design with three factors and three replications. The P1 treatment was recommended by the Swamp Land Agricultural Research Institute by adding chicken manure (5 ton ha−1) and rice husk biochar (5 ton ha−1) while the P2 treatment was recommended by the Vegetable Research Institute by adding chicken manure (10 ton ha−1). The raised beds heights were 20 cm (A) and 30 cm (B). Variance analyses were applied to each observation variable and followed by Duncan's Multiple Range Test at a 5% level. The P1A treatment was the best in improving the shallot production up to 10.88 tons and producing the lowest CO2 cumulative flux up to 0.158 ton ha-1 season-1.

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Soil Chemical Properties and Soybean Yield Due to Application of Biochar and Compost of Plant Waste

Journal of Tropical Soils ◽

10.5400/jts.2016.v21i1.1-7 ◽

2017 ◽

Vol 21 (1) ◽

pp. 1

Author(s):

Junita Barus

Keyword(s):

Rice Husk ◽

Block Design ◽

Chemical Properties ◽

Soil Samples ◽

Soil Chemical Properties ◽

Corn Cob ◽

Soybean Yield ◽

Randomized Block Design ◽

Plant Waste ◽

Rice Husk Biochar

The importance to return organic matter to the soil has been widely recognized, especially to agricultural lands that are low in organic matter and nutrients contents that will decrease the productivity of food crops. This study aimed to study the effect of biochar (rice husk and corn cob biochar) and straw compost on soil chemical properties and yield of soybean (Glycine max (L.) Merr. The experiments were done in the laboratory and the field experiment at February–July 2015. The first study was laboratory test using a randomized block design with three replicates. Soil samples were ground and sieved to obtain the less than 4 mm fraction for the incubation experiment. A five kg soil was mixtured with amandement treatments (A: control; B: Rice husk biochar 10 Mg ha-1 ; C: corn cob 10 Mg ha-1; D: straw compost 10 Mg ha-1; and E. Rice husk biochar 10 Mg ha-1 + straw compost 10 Mg ha-1 ; F. corn cob biochar 10 Mg ha-1 + straw compost 10 Mg ha-1) were filled into plastic pots. The treatments were incubated for 1 and 2 months. Soil samples measured were pH, Organic-C, Total-N, P2O5 (Bray-1), K2O (Morgan), Na, Ca, Mg, S, and CEC. The field experiment was conducted at Sukaraja Nuban Village, Batanghari Nuban sub district, East Lampung Regency. The treatments (similar too laboratory experiment) were arranged in a randomized block design with four replicates. Plot size was 10 m × 20 m, and soybean as crop indicators. The parameters observed were plant heigh, number of branches , number of pods per plant , number of seeds per plant, grain weight, and stover. The results of laboratory experiment showed that application of biochar and compost improve soil fertility due to the increase in soil pH and nutrient availability for plant especially P2O5 and K2O available. The treatment of a rice husk biochar and compost mixture was better than single application to improve soil fertility and soybean yield. Apllication mixture husk biochar 10 Mg ha-1and straw compost 10 Mg ha-1 increased grain weight about 41% compost to control.Keywords: Biochar, compost, crop waste, soil chemical properties [How to Cite: Junita B, Dermiyati and H Sudarsono. 2016. Soil Chemical Properties and Soybean Yield Due to Application Biochar and Compost of Plant Waste. J Trop Soils 21: 1-7. Doi: 10.5400/jts.2015.21.1.1]

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Serapan Hara N, P, K dan Pertumbuhan Tanaman Jagung Pada Berbagai Dosis Pupuk Anorganik dan Organik di Tanah Inceptisol

Jurnal Sains Teknologi & Lingkungan ◽

10.29303/jstl.v0i0.245 ◽

2021 ◽

pp. 55-66

Author(s):

Mulyati Mulyati ◽

Baharuddin AB ◽

R Sri Tejo Wulan

Keyword(s):

Plant Growth ◽

Nutrient Uptake ◽

Agronomic Traits ◽

Block Design ◽

Organic Fertilizer ◽

Fertilizer Application ◽

Organic Fertilizers ◽

Randomized Block Design ◽

Two Factors ◽

Inorganic And Organic

The use of inorganic fertilizers has an important role in increasing plant growth and production. But it also causes various problems such as decreasing soil organic matter, soil acidity, soil degradation, nutrient imbalance and increasing environmental pollution. Therefore, it needs to be balanced with the provision of organic fertilizers. A field experiment was conducted to study the effect of application of various doses of inorganic and organic fertilizers on N, P, K nutrient uptake and maize plant growth. The experimental design used was a randomized block design arranged in a factorial manner consisting of two factors. The first factor is the dose of inorganic fertilizer (A): 0, 150 and 300 kg ha-1 phonska and the second factor is organic fertilizer plus (P): 0, 10, 20 tons ha-1. The two factors were combined and each treatment combination was repeated three times. The data obtained were analyzed by analysis of variance at the 5% level of significance. The results showed that there was no interaction between the application of inorganic and organic fertilizers on the growth and nutrient uptake of N, P and K. However, the application of inorganic and organic fertilizers had a significant effect on all tested agronomic traits except for plant height. Nutrient uptake of N, P and K also increased significantly due to the application of inorganic and organic fertilizers. The balance of inorganic and organic fertilizer application increases the availability of nutrients as well as the uptake of N, P, and K nutrients by maize plants.

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Pertumbuhan, Produktivitas dan Hasil Hablur Klon Tebu Masak Awal-Tengah di Tanah Inceptisol

Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) ◽

10.24831/jai.v46i2.17088 ◽

2018 ◽

Vol 46 (2) ◽

pp. 208 ◽

Cited By ~ 2

Author(s):

Supriyadi , ◽

Ahmad Dhiaul Khuluq ◽

Dan Djumali

Keyword(s):

Sugar Cane ◽

Sugar Industry ◽

Block Design ◽

Sugar Content ◽

Saccharum Officinarum ◽

Sugar Yield ◽

Raw Material ◽

Dry Land ◽

Experimental Station ◽

Randomized Block Design

ABSTRACT Sugar cane is a strategic commodity for the Indonesian government as raw material for the national sugar industry. Cultivation of sugar cane has been shifted to dry areas dominated by Inceptisol, Vertisol, and Ultisol soil. These conditions require certain clones to obtain high sugar yield. New improved varieties have been developed and 8 early-mid maturiting clones have been obtained. The study was aimed to evaluate and obtain earty-mid maturing clones with higher sugar yield than the existing varieties in dry land of Inceptisol soil. The study was conducted at the Karangploso Experimental Station, Malang from July 2015 to September 2016. The study was arranged in a randomized block design with three replications. The treatment consistsed of eight clones of early to mid maturing sugarcane clones and one control variety (Kenthung). The eight clones were (1) PS 04 117, (2) PS 04 259, (3) PS 04 129, (4) PS 05 258, (5) PS 06 391, (6) PS 06 370, (7) PS 06 188, and (8) JR 01. The results showed that three clones (PS 06 188, PS 05 258 and JR 01) produced higher sugar yield (10.45-11.88 ton ha-1), and the other clones showewd lower sugar yield (6.55-9.37 ton ha-1) than that of Kenthung variety (9.16 ton ha-1).PS 06 188 and PS 05 258 clones obtained the highest sugar yield of 11.88 and 11.49 ton ha-1, respectively. Keywords: dry land, performance, Saccharum officinarum, sugar content, variety

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Use of Mulch and Organic Fertilizer on Chrysanthemum

SEAS (Sustainable Environment Agricultural Science) ◽

10.22225/seas.1.2.395.39-45 ◽

2017 ◽

Vol 1 (2) ◽

pp. 39

Author(s):

Yohanes Parlindungan Situmeang ◽

I Gusti Made Arjana ◽

Kadek Siliani

Keyword(s):

Rice Husk ◽

Block Design ◽

Organic Fertilizer ◽

Chicken Manure ◽

Cow Manure ◽

Fresh Weight ◽

Plastic Mulch ◽

Flower Stalk ◽

Highest Weight ◽

Randomized Block Design

This study aims to determine the growth response and yield of chrysanthemum plants in the application of several types of mulch and organic fertilizer. This research uses the basic design of Randomized Block Design with the factorial pattern with 2 factors and 3 replications. The first factor is mulch treatment consisting of 3 levels ie without mulch, rice husk mulch, and black silver plastic mulch. The second factor is organic fertilizer consists of 3 levels namely petrogenic, cow manure and chicken manure. The research results showed that the highest weight of flower stalk was obtained in silver black mulch treatment, increase of 9.63% when compared with the weight of the lowest flower stalk. The highest economic fresh weight was obtained in mulch treatment, increase of 17.53% when compared with the lowest fresh economic weight on mulch rice husk mulch treatment weighing. The highest weight of the flower stalk was obtained in the treatment of cow manure, increased of 10.14% when compared with the lowest weight of the flower stalk obtained in the treatment of cow manure weighing. The highest economic fresh weight was obtained in the cow manure treatment, which increased by 9.91% when compared with the lowest fresh economic interest weight obtained in the treatment of petrogenic fertilizer weighing. Keywords: type mulch, petrogenic, manure; flower

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Respons Benih Kakao Terhadap Amelioran, Mikrob Pelarut Fosfat, dan Pupuk Fosfat pada Tanah Masam

Jurnal Tanaman Industri dan Penyegar ◽

10.21082/jtidp.v7n1.2020.p39-52 ◽

2020 ◽

Vol 7 (1) ◽

pp. 39

Author(s):

Kurnia Dewi Sasmita ◽

Iswandi Anas ◽

Syaiful Anwar ◽

Sudirman Yahya ◽

Gunawan Djajakirana

Keyword(s):

Acid Phosphatase ◽

Rice Husk ◽

Phosphate Rock ◽

Acid Soil ◽

Block Design ◽

Organic Fertilizer ◽

Dry Weight ◽

Available P ◽

Growing Media ◽

Rice Husk Biochar

The growth of cacao in acid soils is commonly limited by some problems such as low available P and pH, and high Al saturation. Therefore, research is needed to solve the problem of coffee cultivation in acid soil. This study aimed to determine the effect of ameliorant, phosphate solubilizing microbes (PSM), and phosphate fertilizers (P) on the growth and nutrient uptake of cacao seedlings, and some acid soil properties. The study used a randomized block design with 3 factors and 3 replications. The first factor was ameliorant applications (without ameliorant, 10% organic fertilizer, 4% rice husk biochar, 4% rice husk biochar + 10% organic fertilizer). The second factor was PSM applications: without PSM, Burkholderia ambifaria (BPF) inoculants, and Aspergillus niger (FPF) inoculants. The third factor was P fertilizers applications (without Phosphate Rock (PR), 100, 200, and 400 mg P/kg of PR, and 400 mg P/kg of SP-36). The results showed that the applications of 4% rice husk biochar + 10% organic fertilizer + BPF or FPF inoculants increase the number of leaves by 77.9% and 69.2%, respectively, and increase the dry weight of shoot by 93.6 % and 101.9%, respectively. Phosphate rock application in media without organic fertilizer increases dry weight of shoots and roots of cacao seedlings, and the uptake of P, Ca, and Mg in shoots linearly in line with the increase of PR dose to 400 mg P/kg. Application of rice husk biochar significantly increased the acid phosphatase activity of growing media. Meanwhile, organic fertilizer increased the soil pH, acid phosphatase and available P activity, and decreased Al-dd growing media.

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