Land suitability is the ability of a land for certain uses. The purpose of this study was to study soil salinity and potential land suitability for cultivation of food crops (cassava and sweet potato) from two different locations in Yoom II Village, North Manokwari District. The research method used was the observation method with survey techniques. Parameters observed were soil physical properties (texture, structure, soil color, surface rock, effective depth, water content) and soil chemical properties (soil pH and soil salinity). The results of the evaluation of land suitability for cassava plants at the two research locations, namely close to the coast (DP) and far from the coast (JP) generally had an actual land suitability class of S3 or marginally appropriate. The main limiting factors for the growth of cassava and sweet potato are surface rock and soil depth, as well as soil pH. Meanwhile, soil salinity was not a limiting factor because the electrical conductivity of the soil is less than 2 dSm-1. Improvement efforts that can be made to increase the land suitability class to be quite suitable (S2) are by cleaning the surface rock and adding organic matter to reduce soil pH.

This study aimed to determine the carrying capacity of agricultural land in providing food to meet the needs of the population in Susweni Village, East Manokwari District. This study used the method of determining or comparing the carrying capacity of land by comparing the availability and needs of land. The results of the calculation of carrying capacity using the concept of calculation according to the regulation of the Minister of the Environment No. 17 of 2009 showed that the Susweni Village, East Manokwari District had a land carrying capacity status that was in deficit for the population living in Susweni Village, East Manokwari District. The availability of land of 78.47 ha and the need for land is 302,084 ha. Therefore, the need for land in the Susweni village is greater than the availability of land in the Susweni village. The deficit carrying capacity of the land in Susweni Village, East Manokwari District is strongly influenced by the population which continues to increase every year.

Tambrauw Regency is obliged to safeguard the policies of the central government, especially in food self-sufficiency efforts. Determine locations that have land suitability specifications for soybeans and analyze farming agribusiness as an important factor in agricultural development. The research activity was carried out in Kebar District and Senopi District. Peanut farmers are the focus of research, with the consideration that peanuts and soybeans are a family (leguminoseae). At this stage, the study of the characteristics and specifications of the Kebar District and Senopi District areas as potential areas for the development of soybean commodities was carried out. The study of the shape, pattern, type and pattern of farming, as well as the use of agricultural production facilities by the farming community is carriedout. Data and information from various branches of farming were held with community discussions in the form of FGD. Data analyzed descriptively. The results showed low availability of potassium in flat areas and forests and acidic soil pH in flat-savanna regions. The hindering area is the slope, and flat areas only lack potassium. Potential food crops to be developed are upland rice plants and yams. The results of evaluation of land suitability for horticultural plants (Peanuts, Mustard, Tomatoes and Chillies) show "quite suitable" to "according to the margins". The farming production of Kebar was dominated by agricultural commodities and provides enough income for the household economy.