Critical period of groundnut in competition to weed

English. Groundnut is categorized into a susceptible in its response to weed interferences. Weeds on groundnut could reduce the growth and ultimately yield up to 47 percent, therefore weed control is feasible to be conducted. Manual weeding is an alternative of weed control in groundnut. Effectiveness of manual weeding is directed by the proper time to conduct such weeding. If groundnut is under weed-free condition during its critical period, it is expected that the productivity is not interfered. Based on the understanding of critical period, manual weeding is more economically viable, because weeding conducted only at around critical period and not necessary to do weeding in whole growing cycle of groundnut. From the research results by using two groundnut varieties namely local Krentil and Gajah indicated that critical period layer under range 40-60 days after planting (dap). If groundnut could be grown free from weeds at least during the period of 40-60 dap, yield of seed 2.8 t/ha could be obtained by Gajah, and 1.7 t/ha by Krentil

Indonesian. Tanaman kacang tanah termasuk tanaman yang peka terhadap gangguan gulma. Kehadiran gulma pada tanaman kacang tanah dapat menghambat pertumbuhan dan menurunkan hasil hingga sebesar 47 persen, oleh karenanya gulma layak dikendalikan. Salah satu alternatif cara pengendalian gulma pada tanaman kacang tanah adalah penyiangan. Efektivitas penyiangan akan sangat ditentukan oleh ketepatan dalam menetapkan waktu pelaksanaannya. Apabila tanaman kacang tanah bebas dari gangguan gulma selama periode kritis diharapkan produktivitasnya tidak akan terganggu. Dengan diketahuinya periode kritis, upaya pengendallian gulma menjadi ekonomis, sebab hanya terbatas di sekitar periode kritis, tidak harus dalam seluruh siklus hidup kacang tanah. Dari hasil penelitian yang telah dilakukan diketahui bahwa periode kritis dua varietas kacang tanah yang diteliti yaitu varietas lokal Krentil dan varietas unggul Gajah berada dalam kisaran umur 45-60 hari