Pemupukan merupakan salah satu cara untuk meningkatkan pertumbuhan dan produksi jagung manis. Salah satu hara esensial yang diperlukan oleh jagung manis adalah kalium. Kalium dapat diperoleh dari pupuk anorganik seperti KCl maupun pupuk organik, seperti arang sekam. Tujuan dari penelitian ini adalah menentukan dosis pupuk kalium terbaik dan pengaruh pemberian arang sekam terhadap pertumbuhan dan produksi jagung manis. Perlakuan disusun secara faktorial menggunakan Rancangan Kelompok Teracak Sempurna (RKTS). Faktor pertama adalah 4 dosis pupuk kalium (K) yaitu: 0 kg ha-1, 50 kg ha-1, 100 kg ha-1, dan 150 kg ha-1. Faktor kedua adalah dosis arang sekam, yaitu 0 kg ha-1 dan 1000 kg ha-1. Data yang diperoleh kemudian dianalisis ragam dan dilanjutkan dengan uji Jarak Berganda Duncan (DMRT) pada taraf α = 5%. Hasil penelitian menunjukkan (1) tidak terdapat interaksi antara dosis pupuk KCl dengan pemberian arang sekam pada semua peubah yang diamati, (2) dosis pupuk kalium 150 kg ha-1 mampu menghasilkan pertumbuhan dan produksi tanaman jagung manis yang terbaik melalui peningkatan tinggi tanaman, diameter batang, bobot basah tanaman, bobot tongkol, panjang tongkol, dan diameter tongkol, namun belum meningkatkan derajat kemanisan jagung manis, dan (3) pemberian arang sekam hingga dosis 1000 kg ha-1 belum mampu meningkatkan pertumbuhan dan produksi tanaman jagung manis secara nyata.

The abundance of predatory arthropods in the rice field ecosystem acts as a biological agent that suppresses pest populations. This study aims to analyze the types of species, individuals, and abundance of predatory arthropods. The research was conducted at the Lampung State Polytechnic Seed Teaching Farm in August-December 2020. The rice plant lines planted by Lampung State Polytechnic were 14 New Type Rice (PTB) lines, namely Pandan Wangi (PW, B1, B2, B3, B4, B7, D2, D3, F3, F4, H1, H4, K, and L2 with 2 and comparable superior varieties namely Ciherang (CH) and Gilirang (Gil)). Rice cultivation is carried out conventionally. Observations of predatory arthropods that inhabit rice canopy were carried out using 3 double swings of insect nets / sweepnets per treatment plot. Insect collection was carried out at 06.00-09.00 WIB then identified in the Food Crops Laboratory II, counting the number of species, number of individuals and relative abundance. The results showed that predatory arthropods that inhabit the canopy of rice plants in several rice plant lines were obtained from the Oxyopidae, Tetragnathidae, Lycosidae, Coenagrionidae, Correidae, Coccinellidae, Chrysomelidae, and Staphylinidae families. The Tetragnathidae and Coenagrionidae families have the highest proportion of species and are found in each rice plant line.

Organic agriculture was a cultivation system that applies the concept of sustainable agriculture. Organic farming systems depend on natural ingredients without using synthetic chemicals. Organic cultivation was environmentally friendly by farming activities by continuing to minimize negative impacts on the surrounding environment. This activity aims to provide knowledge and skills on the concept of sustainable agriculture, which is carried out through the application of an organic farming system at Polinela Organic Farm. Technical guidance activities are carried out at the Polinela Organic Farm, Lampung State Polytechnic, on Tuesday, March 10, 2020. Participants were the Association of ‘Sejahtera Mandiri’ Farmers Groups Rejo Asri Village, Seputuh Raman, Central Lampung. The application of environmental friendly in agricultural aspects was reflected in the management of the concept of organic agriculture carried out by Polinela Organic Farm. The concept of environmental friendly in agricultural development was implemented by taking into various aspects, such as the use of inorganic fertilizers with high efficiency, the application of pest and disease control by notice the natural ecological balance, the application of integrated crop management, the application of a clean and healthy farming system, the maintenance and strengthening of physical fertility, chemical, and biological in nature and the use of effective technology based on local wisdom.

Artropoda predator dapat dioptimalkan perannya di ekosistem sawah untuk menekan populasi hama. Tujuan dari penelitian ini adalah untuk menganalisis nilai indeks keanekaragaman artropoda predator pada galur padi rakitan Politeknik Negeri Lampung. Penelitian ini telah dilaksanakan pada bulan Agustus-Desember 2020. Penelitian dilaksanakan di lahan Seed Teaching Farm Program Studi Teknologi Perbenihan, Politeknik Negeri Lampung dengan galur padi Pandan Wangi (PW), Ciherang (CH), B1, B2, B3, B4, B7, D2, D3, F3, F4, H1, H4, K, dan L2 dengan 2 varietas unggul pembanding yaitu Ciherang (CH) dan Gilirang (Gil). Pengamatan artropoda dilakukan menggunakan metode jaring dilakukan sebanyak 3 ayunan ganda. Pengambilan sampel serangga dilakukan pada pukul 06.00- 09.00 WIB. Identifikasi menggunakan makroskop binokuler di Laboratorium tanaman pangan II. Data hasil identifikasi serangga kemudian dihitung nilai indeks keanekaragaman spesies Shannon (H’), indeks dominasi spesies Berger-Parker (d) dan indeks kemerataan spesies dari Pielou (E). Hasil pengamatan menunjukkan bahwa artropoda predator yang ditemukan adalah laba-laba predator seperti Oxyopes javanus, Tetragnatha javana, T. virescens, T. maxilosa, Pardosa pseudoannulata, Athypena sp., dan serangga predator seperti Microvelia douglasi, Agriocnemis pygmaea, A. femina, A. pieris, dan Verania lineata, Menochillus sexmachulatus, Hispella atra, dan Paederus fuscipes. Nilai indeks keanekaragaman pada setiap galur padi fluktuatif dan berkisar dari rendah ke sedang.

The excessive quantity of groundwater utilization leads to significantly reduced groundwater availability. In another aspect of a tropical country, Indonesia has a reasonably high rainfall in the rainy season. The problem of this research is that the rainwater that has not been utilized and managed to maximize so that only becomes runoff. The community can utilize rainwater for the daily need. This paper presents methods and prototypes of rainwater harvesting and collection at the research locus. Methods of rainwater collection can be done with a rainwater harvesting system in the form of gutter mounted on the roof of the building as a tool to direct the flow of rainwater on the roof to the shelter. Rainfall compared to the roof area, will produce the volume of stored rainwater reservoir as a parameter. The novelty proposed in this study is the value and variable of water parameters in the case study of research implementation This case study was carried out in one of the buildings at Lampung State Polytechnic. The building has 96.72 m 2 of roof area with daily average rainfall equal to 8.6 mm/day (January to May 2018 period). Hence rainwater potency which can be accommodated per day by society is equal to 0.582 m 3 /month with assumption only 70% water rain that collected because of water loss. In the rainy season, the volume of actual rainwater that can be collected as much as 0,831 m 3 /month by ignoring water loss due to evaporation. The quality of rainwater analyzed based on several parameters is pH 4.4, temperature 27,5 o C, turbidity 2.02 NTU, total dissolved solids 20.48 ppm, iron <0.110 ppm, calcium 3.36 mg/l, magnesium 0.233 mg/l, lead <0,021 ppm, hardness 3.69 mg/l, and total coliform 6,1 CFU/100 ml. Testing of the results of this study conducted by testing water quality standards compliance with the regulation of the Indonesia Health Minister number 32 of 2017. Test results show that rainwater can be directly utilized for sanitary hygiene purposes with the improvement of pH value.