Coffee is one of the important commodities in Indonesia. The coffee commodity has strategic potential in the development of the community’s economy. Over time, coffee production in Indonesia has decreased, the average productivity of coffee in Indonesia is only around 600 kg/ha, while the potential for coffee production per hectare can reach 1000 kg/ha. This research was conducted in the Lampung State Polytechnic Coffee crops Experimental Garden, located in Rajabasa Village, Rajabasa District, Bandar Lampung City, in May-October 2021. the tools and materials used in this study were stationery, camera, raffia, meter, thermometer, hygrometer, lux meter, alti meter, coffee clone BP 936, BP 358, and BP 534. This study used a simple 1-factor randomized block design with treatment of 3 superior coffee clones: P1: BP clone 936, P2: clone BP 358, P3: clone BP 534 which was repeated 6 times so that 18 experimental units were obtained. Observational data that has been obtained will be analyzed using analysis of variance (F test) at the 5% level. If there is a significant difference (F count > F table 5%), it will be continued with the Least Significant Difference (LSD) follow-up test with a level of 5%. Based on the results and discussions that have been obtained, it can be concluded that the lowland conditions produce a different climate with the characteristics of the robusta coffee plant, including relatively high temperature, high humidity and high light intensity, while the most adaptive coffee clones in lowland climates are: clone BP 358.

Coffee is one of the most important plantation crops in Indonesia. Coffee has high economic value, significantly increasing income, especially in West Lampung district, Lampung province. Coffee production in this area reaches 954 kg ha. Some subdistricts can produce more than 1,000 kg ha-1 year -1, and some have only reached 500 kg ha-1 year -1 This research was conducted from June to November 2020, to get the effect of shade plants and the effect of types of fertilizers on the productivity of robusta coffee and their interaction on robusta coffee production. The results showed that the amount of chlorophyll content of robusta coffee leaves was not influenced by shade and fertilization, and the interaction between fertilization and shade trees had an effect on leaf surface area.

The objectives of this research to get the frequency and interval of potassium nitrate fertilizer suitable to optimize the growth of oil palm seedlings in the main-nursery. Research will be conducted at the Land Development Lampung State Polytechnic Campus 2 New City, South Lampung, Lampung or at Oil Palm Nursery Unit, Lampung State Polytechnic. The experimental design used a single treatment in a randomized block design (RAK) with 4 treatment levels with 6 repetitions. The treatments consisted of fertilizing KNO3 once a week (W1), fertilizing KNO3 every 2 weeks (W1), fertilizing KNO3 once every 3 weeks (W1), fertilizing KNO3 once every 4 weeks (W1). If the results of analysis of variance was significant it will proceed with the least significant difference test (LSD) at level α = 5%. The results showed that the difference in the frequency of kno3 fertilization resulted in significantly different growth of oil palm seedlings in the main nursery. The frequency of KNO3 fertilization once a week showed higher seedling growth in all observation variables when compared to other treatments and was not significantly different from KNO3 fertilization every 2 weeks.