Djajadi Djajadi
Indonesian Sweetener and Fiber Crops Research Institute

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Changes of Physical Properties of Sandy Soil And Growth of Physic Nut (Jatropha Curcas L.) Due to Addition of Clay and Organic Matter Djajadi, Djajadi; Heliyanto, Bambang; Hidayah, Nurul
AGRIVITA, Journal of Agricultural Science Vol 33, No 3 (2011)
Publisher : Faculty of Agriculture University of Brawijaya in collaboration with PERAGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17503/agrivita.v33i3.75

Abstract

Agricultural sandy soil in Situbondo, East Java province, Indonesia which is used as a center garden for physic nut seed production has poor physical properties of soil indicated by low capacity to retain water. For plant growth of physic nut, the sandy soil physical properties need to be improved. In this study, the influence of addition of clay together with organic matter and intervals of irrigation to sandy soil on aggregate stability, bulk density, total soil porosity, water available content and plant growth of physic nut was investigated. The rates of clay and organic matter incorporated to top sandy soil were 5% clay + 0.8% organic matter and 1O% clay + 1.6% organic matter. Two intervals of irrigation tested were 10 days and 20 days. The results showed that incorporation of clay together with organic matter increased aggregate stability, total soil porosity, available water content and plant growth of physic nut. Intervals of irrigation had no influence of soil physical properties and plant growth.Keywords: agricultural, sandy soil, clay, organic matter, soil properties, physic nut
EFFECT OF IRRIGATION INTERVAL AND SOIL AMENDMENTS ON SOIL ORGANIC C, NITROGEN AND POTASSIUM OF SANDY SOIL AND GROWTH OF Jatropha curcas L. Djajadi, Djajadi; Hidayati, Sulis Nur
AGRIVITA, Journal of Agricultural Science Vol 35, No 2 (2013)
Publisher : Faculty of Agriculture University of Brawijaya in collaboration with PERAGI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17503/agrivita.v35i2.298

Abstract

Inherently, sandy soil is the unfertile soil with low in all aspects of soil fertility and has a low capacity to retain water applied nutrients.  To improve the fertility of sandy soil as media growth of Jatropha curcas, clay and organic matter may have important role when they are incorporated to the sandy soil.  This study investigated the effect of irrigation interval and incorporation of clay together with organic matter to sandy soil on soil organic C, N, and K and growth of J. curcas.  The rates of clay and organic matter incorporated to top sandy soil were 5% clay + 0.8% organic matter and 10% clay + 1.6% organic matter. Two irrigation intervals tested were 10 day and 20 day.  The results found that incorporation of 10% clay + 1.6% organic matter to sandy soil increased soil C organic, N total and exchangeable K which in turn increased number of leaves and number of lateral branches of J curcas.  Irrigation intervals had no effect on all parameters observed.Key words: Jatropha curcas, C organic, Nitrogen, Potassium, clay, organic matter, irrigation interval, plant growth
Tembakau Cerutu Besuki-NO : Pengembangan Areal dan Permasalahannya di Jember Selatan DJAJADI, DJAJADI
Perspektif Vol 7, No 1 (2008): Juni 2008
Publisher : Puslitbang Perkebunan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/p.v7n1.2008.%p

Abstract

ABSTRAKDalam  makalah  ini  diulas  tentang  pengembangan tembakau  besuki  NO  di  daerah  Jember  Selatan, permasalahan  pengembangan  di  daerah  baru,  dan perlunya   teknologi   yang   sesuai   dengan   kondisi agroekologi di wilayah pengembangan baru.  Semula sentra produksi tembakau cerutu Besuki NO adalah Jember   Utara.   Daerah   ini   merupakan   penghasil tembakau mutu pengisi cerutu (filler) yang aromatik. Dengan semakin merosotnya produksi akibat semakin menurunnya kesuburan lahan dan serangan penyakit, maka  penanaman  tembakau  besuki  berpindah  ke Jember  Selatan.  Daerah  Jember  Selatan  merupakan areal  penghasil  tembakau  mutu  pembungkus  dan pembalut  cerutu (dek-omblad)  yang  harganya  lebih tinggi  daripada  mutu  filler.  Kondisi  topografi  dan curah hujan di Jember Selatan berbeda dengan daerah Jember Utara. Daerah Jember Selatan relatif lebih datar, dan tanahnya berkadar partikel liat lebih tinggi, serta curah  hujan  lebih   tinggi   daripada   Jember   Utara, sehingga ketersediaan air bagi pertumbuhan tembakau juga lebih banyak.  Perbedaan ini yang memungkinkan produktivitas tembakau besuki di Jember Selatan (1555 kg/ha) lebih tinggi daripada produktivitas tembakau di Jember   Utara (hanya 791   kg/ha).   Berbedanya karakteristik    wilayah    tersebut    mungkin    juga mempengaruhi karakteristik agroekologi yang sesuai bagi pertumbuhan tembakau untuk berproduksi dan bermutu  tinggi.  Namun  demikian  belum  terdapat informasi   tentang   korelasi   antara   faktor-faktor agroekologi (kesuburan fisik, kimia dan biologi tanah, serta suhu, kelembaban, dan intensitas sinar matahari) dengan   produksi   dan   mutu   tembakau   besuki. Akibatnya adalah teknologi budidaya yang tersedia belum efektif untuk meningkatkan produksi dan mutu tembakau besuki di Jember Selatan.  Diperlukan kajian tentang    faktor-faktor    agroekologi    yang    sangat menentukan produksi dan mutu tembakau, sehingga strategi  peningkatan  produksi  dan  mutu  tembakau akan berbasis pada karakteristik agroekologi daerah Jember Selatan.Kata  kunci  :  Tembakau  Cerutu,  Nicotiana  tabacum, besuki, pengembangan, permasalahan, Jember Selatan. ABSTRACTBesuki Tobacco Cigar: Crop Area Extension and Its Contrainst in South JemberThis paper described crop area extension of tobacco cigar in South Jember and its constraints, and the need of   crop   technologies   based   on   agro   ecology characteristics of South Jember.  In the early of area extension, North Jember had been chosen as a centre of besuki cigar tobacco area to produce cured leaf tobacco used as a good quality filler of cigar.  However, due to declining  of  tobacco  production  and  increasing  of tobacco disease in this area, besuki cigar tobacco area centre   have   been   established   in   new   area   crop extension, South Jember.  The cigar tobacco produced in South Jember is used as wrapper and binder of cigar which the quality prices are more expensive than the quality of filler.  Topography of South Jember is flat with rainfall is higher than North Jember, so that the tobacco yield in South Jember is higher than tobacco yield of North Jember.  The difference of characteristic area  between  South  and  North  Jember  may  also influence the characteristics of agroecology of the two areas. The  characteristics  of  agro  ecology  have important roles in determining yield and quality of tobacco.  Unfortunately, there is no information about the correlation between agro ecology and yield and quality of cigar tobacco in South Jember. Consequently, crop  technologies  available have  not significantly  increased  yield  and  quality  of  cigar tobacco.    The  study  of  correlation  between  agro ecology and yield and quality of cigar tobacco in South Jember is important as a basis of strategy to increase yield and quality of cigar tobacco in South Jember.Key word: Tobacco, Nicotiana tabacum, Na Ogst, besuki, development, South Jember.