Pemanfaatan Tanah Mediteranian Sebagai Media Pembibitan Budset Tebu (Saccharum officinarum L.) Varietas Bululawang dengan Penambahan Pupuk Kandang pada Dosis yang Berbeda

The decrease in the productivity of sugarcane (Saccharum officinarum L.) can be pursued through intensification with treatment in the nursery. However, it is increasingly difficult to find a good growing medium for plants, such as mediterranean soil must be managed. One of the efforts is to increase soil fertility by adding livestock manure which has the potential as organic fertilizer so that it is expected to improve soil structure and add nutrients. This study aims to determine the dose of organic fertilizer in sugarcane bud set nurseries on media with the addition of lime soil. This research was carried out at the independent farm. This study used a non-factorial Randomized Block Design (RAK) with one factor, namely the dose of organic fertilizer (0, 125, 250, 375, and 500 grams/polybag) with 3 replications. The results showed that the addition of organic fertilizer had a significant effect on plant height, number of leaves, and stem diameter of sugarcane nurseries. The best application of organic fertilizer in sugarcane bud set nurseries is a dose of 250 grams/polybag. Keywords: Sugarcane, Nurseries, Mediterranean Soil, Livestock Manure, Organic Fertilizer

The spatial distribution of sago palm landscape Sentani watershed in Jayapura District, Papua Province, Indonesia

Dimara PA, Purwanto RH, Sunarta S, Wardhana W. 2021. The spatial distribution of sago palm landscape Sentani watershed in Jayapura District, Papua Province, Indonesia. Biodiversitas 22: 3811-3820. Sago palm is one of the starch sources used as local food in Papua, therefore this research aims to identify the supporting environment for the plant to grow by utilizing spatial data. The methods used were Spatial Analysis and Field Survey, where the first employed satellite imagery of Quickbird in 2012 and Landsat 8 in 2020 to distinguish between sago and non-sago palm landscape. In the process, five parameters were used, consisting of covering land elevation, slope gradient, soil type, rainfall as well as the optimal distance from the river and lake. The result showed the sago palm landscape in Sentani Watershed lies in the elevation of 0-450 m asl, while its largest habitat which lies between 0-100 m asl covering an area of 4,385.63 is found in a flat slope covering an area of 2,941.99 ha and in a very steep slope that spreads out over 41.92 ha. Generally, in Sentani Watershed, the plant grows in Mediterranean soil possessing thick solum with pH 5.0-7.0 and medium to great soil erodibility. Moreover, the largest habitat experiences a precipitation rate of 1,750 mm yr-1 covering a total of 6,846.24 ha, while the Doyo River has the largest sago palm landscape compared to other rivers.

A Comparison of Organic Cement Made from Recycled Waste Material and Portland Cement

Organic cement is an environmentally friendly alternative to Portland cement which is acquired by recycled organic waste and Mediterranean soil. Waste management is a global problem. The physical characteristic test results of the organic cement show that the weight test of fresh organic concrete is 2081kg/m³ and the dry weight of concrete is 2032kg/m³ which are smaller than Portland cement concrete's which are 2525kg/m³ and 2405 kg/m³ respectively. The fineness of alternative cement grains that passed the 200 mesh sieve is 56%, which is more than Portland cement's which is 52%. The solid weight of alternative cement is 1200kg/m3 whereas the solid weight of Portland cement is 1250kg/m3.

Supplemental Material: Quaternary influx of proximal coarse-grained dust altered circum-Mediterranean soil productivity and impacted early human culture

Sampling approach, soil data, and landscape and soil profile photos.<br>

Supplemental Material: Quaternary influx of proximal coarse-grained dust altered circum-Mediterranean soil productivity and impacted early human culture

Sampling approach, soil data, and landscape and soil profile photos.<br>