WEED SCIENCE

2+1 SKS

Lecturers:1. Irawati, PhD

2. Prof. Ir. Ardi, MSc3. Aries Kusumawaty,

SP.,MSi

Komponen Perkuliahan:

1. Tatap Muka dan diskusi di kelas2. Tugas kelompok dan presentasi• Tiap kelompok membuat makalah

dan presentasi topik minggu ybs• Makalah diserahkan kpd dosen 1

minggu setelah presentasi3. UTS & UAS4. Praktikum

Kuliah ke-

Topik Bahasan Dosen

1 Pengantar, Kontrak Perkuliahan Irawati2 Gulma, Manfaat & Kerugian, serta

KlasifikasinyaIrawati

3 Pertumbuhan dan Perkembangan (Weed Establishment)

Irawati

4 Reproduksi Gulma Irawati5 Reproduksi Gulma (lanjutan) Irawati6 Penyebaran Gulma Irawati7 Kompetisi Gulma - Tanaman Irawati8 - 9 Ujian Tengah Semester Irawati

Kuliah ke-

Topik Bahasan Dosen

10 Allelophaty Ardi11 Invasive Alien Species Ardi12 Metode Pengendalian Gulma 1 Ardi13 Metode Pengendalian Gulma 2 Ardi14 Klasifikasi Herbisida 1 Ardi15 Klasifikasi Herbisida 2 Ardi16 Kalibrasi dan Aplikasi Herbisida Ardi17 - 18 Ujian Akhir Semester (UAS) Ardi

1. Tgl 24-25 August: Meeting jimbaran Consortium di UNUD, Bali

2. Rabu, 26 August (otw PDG), tdk kuliah Gulma Topik I

3. Kita ganti lebih awal, pd jadwal Prakt SELASA 18 August, pkl 13.30-15.10 wib, di Lab. Agro (Presentasi Grup I, Topik I)

4. Rabu, 19 August kuliah (Presentasi Topik II)

What is weed?What is weed? a plant growing out of place

a plant growing where it is not desired --- plant that is useless, unwanted and undesirable

a plant that interfere with man or area of his interest

A plant whose virtues have not yet been discovered

These definitions indicate that any species at any one time can be considered a weed.

A rice plant in an onion field will be considered a weed

Since no plant is absolutely useless at any one time, a weed can also be defined as a plant whose potentials for damage outweigh its potentials for usefullness.

as any unwanted plants under a particular set of circumstances (human-centered), and

as specific species which have a particular set of characteristics which make them highly successful (adapted) in certain environment (species-centered).

Weeds may be viewed in both Weeds may be viewed in both a general sense :a general sense :

Those two aspects of weeds have been drawn together and used to identify and describe what many people consider to be the world’s worst crop weeds

Some 200 or so plant species are estimated to cause 90% of the weed losses to world food production

Whether you realise it or not, weeds are plants familiar to you and can be found at: open field, road sides, fence, ditch, ponds, lakes, river banks, backyard, farm, forest, etc.

land preparation resource competition & allelopathy host for pest & diseases harvesting obstacles reduce the quality of yield (weeds & weed seeds) clogging water ways rail ways and side-road invasion reduce O2 in ponds & lakesHazard of health (pollens, asthma) aesthetics

Effects of weeds on agricultural Effects of weeds on agricultural crops :crops :

may provide some ground cover & prevent erosion of fragile soils in time of droughtseeds & foliage may be of some feed value for livestockprovide nectar for honey productionmay protect newly establishing pasture seedlings from being grazed‘wildflowers’ that attract tourist industrysome aquatic weeds are able to remove excess nutrients & other pollutants from domestic and industrial effluent

Beneficial effects of weeds :Beneficial effects of weeds :