Browsing by Author "Suminarti, Nur E."

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    Growth, yield and radiation energy conversion of sweet potato (Ipomoea batatas (L.) lam.) plant under different stake angles and various mulch type in the Papua highlands
    (IOP Publishing, 2021-01-01) Alberth, Soplanit; Rumbarar, Merlin K.; Suminarti, Nur E.; IOP
    The aim of this study was to obtain the right type of reflector in sweet potato plant cultivation combined with a stake technique to increase the efficient use of solar radiation energy and plant productivity. The experiment was arranged in a Split Plot Design with three replications. The main plot consisted of Cangkuang variety with 90° stake and Cangkuang variety with 60° stake. The subplots consisted of without mulch, straw mulch, white sand mulch, clear plastic mulch and silver black plastic mulch. The results show that the total dry weight continues to increase but then slows down when the crop growth rate decreases especially at the tuber development phase. The total dry weight at the silver black plastic mulch treatment with a 60° stake angle increased by 70.13% at the age of 70 to 100 days after planting and only increased by 17.50 % at the age of 100 to 130 days after planting. The conversion efficiency of radiation energy increases for all mulch uses as a reflector, especially for 60° stake angles of 32.03% at the highest tuber yields 34.15 t/ha while for 90° stake angles of 27.35% at the highest tuber yields 29.72 t/ha. The highest energy conversion efficiency value was obtained in the combination of black and silver mulch with a 60° stake angle at 2.81%
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    Relationship between yield and growth of sweet potato (Ipomoea batatas L.) on abiotic stress in Papua highland, Indonesia: Adaptation of varieties and sticks inclination angles
    (Bioscience Research, 2018-02-15) Soplanit, Alberth; Guritno, Bambang; Suminarti, Nur E.; Bioscience Research
    One of the strategies to increase the use of low solar radiation in sweet potato plants (Ipomoea batatas Lam.) in Papua highlands is to modify the plant environment. The research was done by adapting the varieties and sticks inclination angles on the abiotic stress condition due to the high level of resistance. The field experiment used three varieties of sweet potato, combined with four sticks angles using a randomized group design with three replications. Sweet potato yield consistently correlated strongly with leaf area index, crop growth rate, net assimilation rate and total dry weight. Results of tuber yields per hectare were strongly correlated with LAI (r = 0.771**), CGR (r = 0.868**), strongly correlated with NAR (r = 587*) and were very strongly related with TDW (r = 0.904**). Cangkuang variety combined with 60 0 and 90 0 angles yielded tubers of 28.86 t ha -1 and 31.53 t ha -1 .
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    Teknik Penggunaan Ajir pada Beberapa Varietas Ubi Jalar (Ipomoea batatas L.) di Dataran Tinggi Papua
    (Balai Pengkajian Teknologi Pertanian Papua, 2020-06-24) Soplanit, Alberth; Rumbarar, Merlin K.; Tirajoh, Siska; Suminarti, Nur E.; Kementrian Pertanian
    Penelitian ini bertujuan untuk mendapatkan efisiensi penggunaan energi radiasi matahari yang tinggi dengan mengkombinasikan varietas dan kemiringan (sudut terhadap horizontal) ajir pada budidaya tanaman ubi jalar di dataran tinggi Papua. Penelitian berlangsung pada tanah entisol, ketinggian 1560 m di atas permukaan laut dari bulan April - September 2016. Rancangan lingkungan adalah faktorial yang disusun dalam Rancangan Acak Kelompok dengan tiga ulangan. Faktor A (varietas) terdiri dari tiga varietas, yakni Siate (lokal), Papua Sollosa dan Cangkuang; faktor B (sudut kemiringan ajir) terdiri dari empat sudut yakni tanpa ajir, kemiringan ajir 45°, 60°, dan 90°. Hasil penelitian menunjukkan bahwa luas daun spesifik (LDS) menurun mengikuti peningkatan kemiringan ajir pada semua varietas, dengan bobot kering umbi tertinggi 248,7 g per tanaman dihasilkan oleh varietas Cangkuang pada kemiringan ajir 90°. Hasil umbi tertinggi secara berturut-turut diperoleh oleh varietas Cangkuang pada kemiringan ajir 90° dan 60° masingmasing 31,53 ton per ha dan 28,86 ton per ha. Pada kondisi cekaman abiotik akibat tingkat keawanan tinggi di dataran tinggi Papua, dianjurkan untuk menanam varietas ubi jalar Cangkuang atau varietas dengan karakter berdaun lebar dikombinasikan dengan penggunaan ajir dengan kemiringan 90° dan 60°.