The common problem of acid sulfate soils is their acidity, which affects the availability of nutrients. Soil pH is an important factor because interval pH defined the availability of nutrients in the soil. Amelioration could improved soils pH, and techniques that are often used is liming. However, Ramsar convention lime’s application is not recommended because of its potential harm to the environment. Due to that reason, this study was conducted to identify the effect of Pleurotus ostreatus substrates compost on the chemical properties of acid sulfate soils. The greenhouse experiment was arranged in completely randomized design (CDR) with five treatments, i.e. 0 (b0), 5 (b1), 10 (b2), 15 (b3), and 20 (b4) ton ha−1. The highest value of pH (5.05), available N (1.70 ppm and 2.13 ppm, ammonium (NH4 +) and nitrate (NH4 −), respectively), and organic carbon (C) (3.45%) was found in the b4 treatment, compared to control, the b4 treatment improved about 40.50%, 77.50%, and 40.82% for NH4 +, NH4 −, and organic-C, respectively. While, the highest available phosphorus (P) (16.36 ppm) was found in the b3 treatment, which improved about 166.88% compared to control (b0). Application of Pleurotus ostreatus substrates compost was able to ameliorate the chemical properties of acid sulfate soils.

No abstract

Rice production in South Kalimantan experienced diminishment in recent years. One of the problems that created this issue was the decline of soil fertility. Application of synthetic fertilizers in a long term would decline the soil fertility and subsequently diminished the productivity of rice field. Alternative application of organic fertilizers was one of the contemporary arrangements to maintain the stability of soil fertility and finally impacted the improvement of rice productivity. This study aims to determine the effect of the interaction between the dose of chicken manure combined with indigenous microbes (IMO) on the growth and yield of rice plants. This research was conducted from August to November 2020 at the Greenhouse of the Department of Agroecotechnology, Faculty of Agriculture, Lambung Mangkurat University (3° 26' 35.5488'' S 114° 50' 19.986'' E). The experimental design was Completely Randomized Factorial Design (CRD). The first treatment was chicken manure (k) which consists of 5 dosages, 0 t ha -1 (k0), 10 t ha -1 (k1), 20 t ha -1 (k2), 30 t ha -1 (k3), and 40 t ha -1 (k4), and the second treatments was the IMO (m) in 3 different types, namely control without IMO (m0), treatment IMO originated from waste cabbage (m1) and pineapple peel (m2). The boundary parameters in this study were the plant height, the number of tillers, the number of productive tillers, the weight of dry grain, and the weight of 100 grains of rice. The outcomes showed that there was no interaction impact between chicken manure and IMO treatments, yet it significantly affected on each treatment factor. Chicken manure had significant effects on all parameters, while IMO just impacted the number of productive tillers. The best treatment of chicken manure in rice plant growth was k1 (10 t ha -1 ) was able to improve plant height by 13.3% and the number of tillers was 17.8%; the k4 (40 t ha -1 ) increased the number of productive of tillers; while the best treatment of rice yields was k2 (20 t ha -1 ) which increased the dry grain weight by 44.9% and the weight of 100 grains by 8.7% and all these results significantly contrasted to the control treatment k0 (0 t ha -1 ). The IMO from waste of pineapple peel and cabbage gave the similiar significant results in increasing the number of productive tillers by 9.23% compared to the control treatment which was only 0.12%.

No abstract

Rosella merah (Hibiscus sabdariffa L.) adalah tanaman asli dari daerah yang terbentang mulai India hingga Malaysia, termasuk Indonesia. Namun di Indonesia pada kenyataannya pembudidayaan rosella merah masih terpusat di daerah-daerah tertentu seperti di pulau Jawa. Di Kalimantan Selatan, rosella mulai dikembangkan yaitu di desa Maburai Kabupaten Tabalong (laporan KKN, 2018). Mengingat manfaat rosella yang sangat baik bagi kesehatan yaitu kandungan antioksidan yang tinggi dari bunga rosella yang bisa menangkal radikal bebas dan menetralisir racun yang ada di jaringan dan sel-sel tubuh, juga menjaga kesehatan organ hati serta melawan bakteri yang masuk kedalam tubuh. Sehingga bunga rosella mulai dikembangkan untuk dijadikan produk minuman berupa sirup rosella. Untuk mendapatkan benih yang baik, daya berkecambah dan potensi tumbuh yang tinggi diperlukan teknologi perlakuan untuk menigkatkan viabilitas benih seragam dan bermutu. Penggunaan mikroorganisme rhizobakteri atau dikenal sebagai PGPR (Plant Growth Promoting Rhizobacteria) dapat memberikan daya kecambah dan percepatan tumbuh rosella. Penelitian ini bertujuan untuk mengetahui interaksi perendaman dengan konsentrasi PGPR yang berbeda untuk mendapatkan viabilias yang terbaik. Rancangan yang digunakan adalah Acak Lengkap (RAL) dua faktor. Faktor pertama adalah konsentrasi PGPR yang terdiri dari KNO3 20 g.l-1 (k0), PGPR 5 ml.l-1 (k1), PGPR 10 ml.l-1 (k2) dan PGPR 15 ml.l-1 (k3). Faktor kedua adalah lama perendaman yaitu 8 jam (l1), 12 jam (l2) serta 24 jam (l3), perlakuan diulang sebanyak 3 kali. Hasil penelitian menunjukkan bahwa konsentrasi PGPR dan perendaman terbaik dalam meningkatkan viabiltas benih rosella adalah pada perlakuan konsentrasi PGPR 5 ml dengan lama perendaman 8 jam (k1l1) dimana menghasilkan potensi tumbuh maksimum sebesar 85,33%.