A laboratory study was conducted to evaluate the effects of varying 15 N concentrations on crop residue quality (rice straw=RS and soybean=SY) and N mineralization. Two crops (rice and soybean) were grown in a glass-house under four 15 N concentrations, i.e., 0 mM (N0), 0.625 mM (N1), 2.5 mM (N2) , and 10 mM (N3) supplied as CO( 15 NH 2 ) 2 , in 30 cm diameter plastic pots containing 5 kg of quartz sand. Eight weeks after planting the above-ground biomass was pruned and oven dried at 60 o C for 48 hours and analyzed for polyphenol, lignin, N, C, C/N, organic matter and % 15 N-abundance. Each of the eight crop residues produced from this experiment was then incorporated into 10 g of soil in a 50 ml plastic bottle. Mineralization of N from the residues was measured over a 14-week period under controlled non-leaching conditions.The results showed that increasing N concentration in the nutrient solution (0 to 10 mM) increased total N but decreased C, lignin and polyphenol content in the crop residues. The results suggested that N supply may increase the quality of the crop residues, as indicated by decreasing of C/N, lignin/N, polyphenol/N ratios. SY residue released N about 2x faster than RS residue, and the amount N released increased with increasing supply of the N concentration. At the 10 mM N supply, RS and SY residues released respectively 3734,857 mg kg -1 and 4352.34 mg kg -1 cumulative amount of mineral N with the mineralization rate about 7x faster than without 15 N in the solution. Differences in the %N mineralized were determined by the quality of the crop residues. Regression analyses showed that the N, lignin and polyphenol contents were the residues quality factors which could be used to predict N mineralization of the crop residues, and the relationship was best described by a linear regression.

Tegalweru village, Dau, Malang regency is known as a high producer of horticultural crops with a total area of horticultural crops to ± 336 ha or 80% of the total area of agricultural land. To maintain the productivity of horticultural crops is necessary land management system with organic inputs. However, the availability of compost in this village is still inadequate. Compost production system that is not running optimally, although it has been available the tools for composting. An understanding of composting technology is still low. Specific targets to be achieved in this activity is an increase in the compost product produced from compost production systems that exist in the two farmers groups Weru Asih I and II, who became a partner in this activity. IbM activities were implemented through several stages: (1) extension of composting technology and the role of organic matter (2) the training and mentoring of making compost, (3) Building composting home, and (4) Counseling and guidance of management system of sustainable compost production. The results of this work showed that horticultural farmers at Tegalweru village already can independently make compost with a high quality. This activity greatly helped to provide compost for farmers. It is also able to improve the understanding of the members of farmer group in maintaining soil fertility. For the sustainability of this program, implementation of barter management system between compost material with mature compost can be used as an initial step in the development of commercial compost production at Tegaweru village.

Tujuan yang ingin dicapai dalam program ini adalah menghasilkan cacing tanah dan vermikompos sebagai wahana menciptakan lapangan pekerjaan tambahan dengan memanfaatkan limbah jamur tiram putih. IbM telah dilaksanakan di desa Blayu, kecamatan Wajak, kabupaten Malang, Jawa Timur, selama enam 8 bulan yaitu pada April - Nopember 2016. Metode yang digunakan dalam IbM ini adalah penyuluhan, pelatihan, demonstrasi, dan pendampingan. Hasil dari kegiatan Program Ipteks bagi Masyarakat ini dapat disimpulkan antara lain: 1). Petani jamur tiram putih yang tergabung pada kelompok tani Guyub Makmur I dan II telah menguasai teknologi metode budidaya cacing tanah, sutera dan vermikompos mencapai 85%; 2). Telah tersedia sarana budidaya cacing tanah dan sutera dengan model Semi Closed Resirculating System (SCRS) guna untuk memanfaatkan limbah jamur tiram putih yang telah ada; 3). Capaian 100% kelompok tani Guyub makmur I dan II telah dapat mengembangkan bibit cacing tanpa harus beli dari luar daerah; 3) Telah dihasilkan 2 buku ajar Teknologi Tepat Guna (TTG) yang akan diterbitkan oleh Aditya Media Publishing dengan ber-ISBN

Pistia has no economic value. However, when mixed into straw compost, it tends to enhance its quality. Therefore, this study aims to determine how the Pistia mixture can improve the straw compost quality, thereby increasing rice production. The treatments consisted of soil (control) in values of P100, P75 + J25, P50 + J50, P25 + J75, J100, and NPK. The quality of compost observed was: N, P, K, C/N, lignin, polyphenols, cellulose, and organic matter content. N cumulative and N mineralization rate observed in the second stage was carried out at the incubation 1, 2, 4, and 8 weeks, N mineralization, N uptake, N absorption efficiency, growth, and yield as variables observed in the third stage. This research was conducted to determine the effect of adding a compost mixture with Pistia and straw towards the efficiency, growth, and production of upland rice plants. The results showed that the more Pistia mixed in the straw, the better the compost quality, growth, and yield above J100. N uptake was associated very strongly with the number of panicles and total dry weight of the plant.

The aim of this research was to determine the growth and production of white oyster mushrooms and ear mushrooms on various types of substrates as well as the R/C value of farming ratios. Research has been carried out in the Integrated Laboratory of the Faculty of Agriculture, Unisma of Malang. The study was conducted from September 2017 to January 2018. The research design used the factorial completely randomized design (CRD) with two factors. The factor I, kinds of planting substrate (N) consisting of 4 types, N0 (control), N1 (15% waste powder substrate mixture), N2 (30% waste powder substrate mixture), N3 (45% waste powder substrate mixture). Factor II, F1: White oyster mushrooms, and F2: Ear mushrooms. The conclusions obtained show white oyster mushrooms have the best fresh fruit body weight, with a total weight of 564.4 g per log, significantly different from the ear mushroom which only has a total fresh weight of 242,7 g fruit body. The white oyster mushroom type has the best BE value with a percentage of 47%, significantly different from the type of ear mushroom which has an BE value with a percentage of 20.3%. The value of R/C ratio in the substrate treatment without the rejected mixture on white oyster mushrooms in the value of R/C ratio of 1.9.