In the last few years, soil deterioration due to excessive application of synthetic agrochemical has become growing concern. Use of organic fertilizer is believed to be able to enhance soil quality. The objective of this experiment was to determine nitrogen, phosphorus, and potassium uptakes by sweet corn as affected by local based liquid organic fertilizer (LOF) under closed agriculture system. The experiment was conducted in Closed Agriculture Production System (CAPS) Research Station in Air Duku Village, Bengkulu, Indonesia from March to June 2015, employing Randomized Completely Block Design with 2 factors. The first factor was 3 sweet corn genotypes, i.e. Talenta, Jambore, and Asian Honey and the second factor was 5 rates of LOF, i.e. 0, 25, 50, 75, and 100 mg l-1 , respectively. Each treatment combination was replicated 3 times. Foliar application of LOF was carried out every week at 2-8 weeks after planting (WAP) with total volume of 600 ml per plant. Sweet corn leaves were sampled at the beginning of tassel emergence. The experiment revealed that sweet corn genotype significantly influenced the uptake of nitrogen, but not phosphorus and potassium. It was observed that Asian Honey genotype absorbed highest nitrogen as compared to other genotypes. In addition, increase in rates of LOF significantly raised nitrogen uptake by sweet corn, but not phosphorus and potassium.

Cekaman kekeringan menyebabkan terjadinya perubahan terhadap pertumbuhan dan produksi tanaman diantaranya terjadinya penurunan laju asimilasi. Percobaan dilaksanakan di Rumah Plastik Lapangan Riset Padi Babakan, University Farm IPB, Bogor (± 240 m dpl) pada bulan September 2011 sampai February 2012. Rancangan penelitian menggunakan rancangan split plot 3 ulangan, dengan dua faktor perlakuan yaitu faktor utama (Cekaman kekeringan) sebagai petak utama yang terdiri dari penghentian pemberian air umur 3Minggu Setelah Transplanting (3MST) sampai panen; Penghentian pemberian air umur  6 MST sampai panen; penghentian pemberian air umur 9 MST sampai panen dan  kontrol.  Sedangkan faktor kedua adalah varietas yang ditempatkan sebagai anak petak yaitu IR 64, Ciherang, IPB 3S, Way Apo Buru, Jatiluhur, Menthik Wangi, Silugonggo dan Rokan. Hasil penelitian menunjukkan perlakuan cekaman kekeringan pada saat awal fase vegetatif sampai panen dan pada fase pra antesis sampai panen menyebabkan terjadinya penurunan laju asimilasi bersih berkisar 42.96%-78.95% dan laju tumbuh relatif berkisar 22.95%-69.62%. Varietas Jatiluhur dan Ciherang memiliki laju asimilasi bersih yang lebih tinggi pada perlakuan cekaman kekeringan yang diberikan pada awal fase vegetatif sampai panen

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Purple nutsedge (Cyperus rotundus L.) is a noxious weed that contains allelochemicals which inhibit other plants

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