<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.

Penelitian ini bertujuan untuk mengetahui pengaruh aplikasi jamur Trichoderma dan Mikoriza terhadap pertumbuhan bibit kelapa sawit di pre nursery. Penelitian dilaksanakan di kebun Sungai Bungur Estate (SBGE), PT Prisma Cipta Mandiri yang berlokasi di Kecamatan Kikim Timur, Kabupaten Lahat, provinsi Sumatera Selatan. Rancangan percobaan faktorial yang disusun dalam Rancangan Acak Lengkap (RAL). Faktor pertama yaitu dosis jamur Trichoderma terdiri dari 4 aras yaitu dosis 0 g/bibit, dosis 5 g/bibit, dosis 10 g/bibit dan dosis 15 g/bibit, sedangkan faktor yang kedua yaitu dosis jamur Mikoriza yang terdiri dari 4 aras yaitu dosis 0 g/bibit, dosis 5 g/bibit, dosis 10 g/bibit dan dosis 15 g/bibit. Hasil penelitian menunjukkan bahwa tidak ada interaksi nyata antara pengaplikasian Trichoderma dan Mikoriza terhadap pertumbuhan bibit kelapa sawit di pre nursery. Pengaplikasian Trichoderma  dosis 10 g/bibit memberikan hasil yang baik pada selisih tinggi bibit umur 30 hst dan 120 hst dengan rerata 3,87 cm, rerata pertambahan tinggi bibit per minggu yaitu 0,35 cm , diameter batang kelapa sawit umur 120 hst dengan rerata 8,40 mm, selisih diameter batang  30 hst dan 120 hst yaitu 4,60 mm, rerata pertambahan diameter batang per minggu dengan rerata 0,42 mm, selisih LAI terbaik (30 hst dan 120 hst) yaitu 32,83 cm2, dan rerata pertambahan LAI terbaik bibit per minggu dengan rerata 2,98 cm2. Pengaplikasian Mikoriza  dosis 10 g/bibit memberikan hasil terbaik pada semua parameter pertumbuhan bibit kelapa sawit, kecuali pada parameter pertumbuhan bibit kelapa sawit umur 30 hst  dan rerata pertambahan jumlah daun per minggu.   Kata kunci : Kelapa sawit, biofertlizer, Trichoderma, Mikoriza.

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

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