<p>This research aimed to evaluate the effect of empty fruit bunches (efb) compost, phosphate-solubilizing bacteria (PSB), lime, and types of P fertilizer on the growth and availability of Phosphorus and P uptake in the pre-nursery (PN) oil palm seedlings in latosols. The pot experiments were arranged in a Factorial Completely Randomized method. The first factor was the application of efb compost: without efb compost, efb compost, without efb compost + PSB, and without efb compost + lime. The second factor was the types of P fertilizer: SP-36, RP, guano, and NPKMg + Urea as a control. The results showed that the combination of without efb compost +lime and RP fertilizer produces the highest number of leaves. The influence of a single factor showed that the application of without efb, efb compost, without efb compost +PSB, without efb compost + lime, resulted in the same growth of seedlings, except on plant height and the length of the leaf. The various types of P fertilizer led to the same growth of seedlings except for stem diameter. The highest available P was obtained in the combination of without efb compost + PSB with SP-36 fertilizer, which was 631.1% compared to control (without efb compost and NPKMg, Urea) and the lowest in the combination of without efb compost + lime with (NPKMg, Urea). The treatment without efb compost + lime with SP-36 fertilizer increased P uptake of leaves by 55.6% and stem by 47.1% compared to control.</p>

The purpose of this study was to determine the effect of various concentrations of liquid organic fertilizer from market waste on the growth and N uptake of oil palm leaves seedlings in pre-nursery. This experiment used a completely randomized design with ten replications. There were eight treatments namely 15%, 25%, 35%, 45%, 55%, 65%, chemical fertilizer (NPKMg and urea) as control and solid compost. The results showed that the application of liquid organic fertilizer at concentrations of 35% to 45% and solid compost gave the highest stem diameter and N uptake of oil palm leaves. The application of liquid organic fertilizer from a concentration of 25% to 45% and solid compost gives the highest dry weight and leaves of oil palm seedlings. Application of liquid organic fertilizer with a concentration of 45% to 65%, solid compost, or chemical fertilizer produces the highest amount of chlorophyll.

Tujuan penelitian untuk mengetahui komposisi media tanam dan pupuk NPK yang sesuai untuk pertumbuhan dan hasil bawang merah. Penelitian menggunakan pola faktorial, disusun dalam rancangan acak lengkap. Faktor pertama perbandingan komposisi media tanah : pupuk kandang : arang sekam yang terdiri dari tiga aras yaitu (1:1:0), (1:1:1) dan (2:1:1). Faktor kedua adalah macam pupuk NPK terdiri dari empat aras yaitu NPK 16-16-16, NPK 15-15-18, NPK 21-21-21+TE dan KNO3 sebagai pembanding. Setiap perlakuan diulang  3 kali sehingga diperoleh 36 satuan percobaan . Penelitian ini dilakukan menggunakan polybag dan dimulai  bulan Januari sampai April 2021. Hasil pengamatan dianalisis dengan sidik ragam pada jenjang nyata 5 %. Apabila ada beda nyata diteruskan uji lanjut Duncan’s Multiple Range Test (DMRT) pada jenjang nyata 5 %. Hasil penelitian menunjukkan kombinasi terbaik pada media tanah : pupuk kandang : arang sekam (1:1:1) dengan NPK 21-21-21+TE pada tinggi tanaman,  kombinasi media tanah : pupuk kandang : arang sekam (2:1:1) dengan pupuk NPK 21-21-21+TE pada berat segar tajuk dan berat segar tanaman. Komposisi media tanaman berpengaruh terhadap jumlah umbi dan berat segar akar, terbaik pada komposisi media tanam tanah : pupuk kandang : arang sekam 1:1:1 dan 2:1:1. Macam pupuk NPK berpengaruh terhadap berat segar umbi, yang terbaik pupuk NPK 21-21-21+TE.

This study aims to determine the effect of the dose of arbuscular mycorrhiza fungi (AM) and the administration of inorganic fertilizers on the growth and yield of sweet corn. This research was conducted in Kota Bangun Village, Tapung Hilir, Kampar, Riau in June to August 2020. The experimental design used was a completely randomized design consisting of two factors and four replications. The first factor was the dose of AM fungi consisting of 4 levels, namely 0 g / plant, 10 g / plant, 15 g / plant, 20 g / plant. The second factor was the administration of inorganic fertilizer consisting of 4 levels, namely (6 g NPK + 4 g urea)/plant, (4.5 g NPK + 3 urea)/plant, (3 g NPK + 2 g urea)/plant, (1.5 g NPK + 1 g urea)/plant. The observations were analyzed using Analysis Of Variance (ANOVA) at a  level of 5%, a significantly different among treatment in further tests with Duncan's Multiple Range Test (DMRT) at a level of 5%. The results showed that there was no good combination the dose of AM fungi  and inorganic fertilizers on the growth and yield of sweet corn crops. The dose of AM fungi 10 g / plant gives a better influence on diameter of stem and the percentage of AM infection, inorganic fertilizer administration dose (6 g NPK + 4 g urea) produces the best cob weight.  Keywords: Sweet Corn, Mycorrhiza Arbuscular, Inorganic Fertilizer

This study aims to determine the growth response of Pueraria javanica to Rhizobium sp. doses on different soil types. This research was conducted in the local community garden located in Maguwoharjo Depok District, Sleman Regency, D. I. Yogyakarta at an altitude of 118 Meters Above sea level. The research method used is factorial with a complete randomized design (RAL). The first factor is the dose of Rhizobium sp. sp. consists of 4 levels, namely 0 g (control), 5 g, 10 g, and 15 g.  The second factor is the type of soil consisting of 3 levels, namely regosol, latosol, and grumosol. The results showed interaction between the dose of Rhizobium sp. with different types of soil against the best plant height in the soil type grumusol with various doses of Rhizobium sp. and the best dry root weight in the soil type grumusol with a dose of Rhizobium sp. 10 g. Rhizobium sp. dose gives the same effect on the growth of Pueararia javanica in number of leaves, fresh weight of header, dry weight of header and number of root, except at fresh root weight. Kata kunci       : Pueraria javanica, Rhizobium sp., regosol, latosol, grumusol

To obtain quality cocoa seedlings, maintenance efforts are required during the nursery stage, including meeting the nutritional needs of the planting medium which can be in the form of organic fertilizer from goat manure and husk charcoal. In addition, efforts to improve growing media in nurseries can be used with biological fertilizers, including plant growth promoting rhizobacteria (PGPR). Goat manure for plant nutrients, as well as a source of nutrients for PGPR. The research objective was to determine the effect of media composition and PGPR on the growth of cocoa seedlings. Research with the experimental method of factorial design consisting of two factors was arranged using a completely randomized design. The first factor was soil planting medium: goat manure: husk charcoal (v/v) consisting of 3 levels: M0 = 1:0:0 (control), M1 = 1:1:0 and M2 = 1:1:1. Factor II, namely the dose of PGPR consists of 3 levels: K1 = 10 ml/seedling, K2 = 20 ml/seedling, and K3 = 30 ml/seedling. With three repetitions. Observational data were analyzed with variance at the 5% level. To find out the differences between treatments, the Duncan's Multiple Range Test was continued at 5% level. The results showed that there was no significant interaction between media composition and PGPR dosage on the growth of cocoa seedlings. The composition of the soil medium : goat manure : husk charcoal 1:0:0 and 1:1:0 gave good growth of cocoa seedlings. PGPR doses provide the same growth of cocoa seedlings.

Penelitian ini bertujuan untuk mengetahui respon pertumbuhan bibit kelapa sawit di pre nursery terhadap pemberian media tanam (tanah pasiran, tanah lempungan, tanah pasiran + lempungan) dan limbah tahu sebagai bahan organik. Penelitian ini dilaksanakan di lahan pertanian milik masyarakat di Jalan Karangsari, Werdomartani, Depok, Sleman, Yogyakarta pada bulan Maret sampai Juni 2020. Penelitian ini menggunakan metode percobaan pola faktorial yang disusun dalam Rancangan Ancak Lengkap (RAL) terdiri dari dua faktor. Faktor pertama adalah media tanam terdiri dari 3 macam yaitu : Pasiran, Lempungan, Pasiran + Lempungan. Sedangkan faktor kedua adalah Limbah Tahu terdiri dari 3 macam yaitu: Limbah Tahu padat, Limbah Tahu, NPK + Urea kontrol. Data hasil penelitian dianalisis dengan menggunakan sidik ragam (Anova) pada jenjang nyata 5%. Apabila terdapat berpengaruh nyata, dilanjutkan dengan uji DMRT pada jenjang nyata 5%. Hasil analisis menunjukkan bahwa tidak terjadi kombinasi antara media tanam dan limbah tahu terhadap pertumbuhan bibit kelapa sawit di pre nursery. Media tanam memberikan pengaruh terhadap pertumbuhan bibit kelapa sawit dengan media tanam pasiran+lempungan menghasilkan bibit yang terbaik. Limbah tahu tidak berpengaruh terhadap pertumbuhan bibit kelapa sawit. Kata kunci : Kelapa sawit, Pre Nursery, media tanam, limbah tahu

Plant growth-promoting rhizobacteria (PGPR) is a type of microbe that can boost root development and plant growth by interacting with plant roots. The goal of this study was to examine how oil palm mill byproducts and PGPR can affect oil palm seedling growth in a pre-nursery. The study was conducted using a completely randomized design with factorial treatments. The empty oil palm bunches (EFB) were divided into three levels: soil:compost EFB (1:1), soil:ash EFB (1:1), and a control soil. The second variable was the PGPR dose, which was divided into three levels: chemical fertilizer (control), 20 ml, and 30 ml. Each treatment combination was repeated five times. The research findings were analyzed using analysis of variance to determine the true difference between the treatments tested using Duncan’s multiple range test at 5%. There was no interaction between the administration of EFB and the dose of PGPR in the growth of pre-nursery oil palm seedlings, according to the findings. Oil palm seedlings grew well in EFB compost in a pre-nursery setting. In pre-nursery palm head seedlings, PGPR application at a dose of 20 ml was able to provide good growth. Keywords: Pre-nursery, Empty Fruit Bunch, Organic Fertilizer, PGPR