Effect of Weed Emergence Time and Intervals of Weed and Crop Competition on Potato Yield

Abstract

A field study was conducted at Vezaiciai branch of the Lithuanian Institute of Agriculture from 1998 to 2000 to determine weed emergence dynamics in potato and to estimate the effect of different intervals of weed crop competition on potato tuber yield. Treatments varying in intervals of weed-free conditions and competition were laid out in a randomized complete block design with six replications. The greatest emergence of annual broadleaf weeds (62 to 86% of the season total) in the crop was observed in the period from potato planting until flowering. Emergence of winter annuals such as field violet and scentless mayweed was greatest in the period from the 20-cm potato plant height until harvesting. Competition was most detrimental to potato tuber yield in the periods from planting until flowering, from planting until 25 d after flowering, or for the entire growing season. Potato tuber yield decreased by 8.1, 8.4, and 6.4%, respectively, during these competition intervals compared to the weed-free treatment. The results indicated that the critical weed-free period, when weed competition was detrimental to yield, started from planting until 25 d after flowering if regular interrow cultivation was applied.

Interferência de plantas daninhas na cultura do sorgo sacarino

“…Among them, the integrated weed management stands out as one of the main bottlenecks in the production system, because the weed control in inappropriate time may adversely affect the production cost and/or result in qualitative and quantitative losses in crop yield (Ciuberkis et al, 2007).…”

Períodos de interferência de uma comunidade de plantas daninhas na cultura da batata

“…Vários pesquisadores verificaram que a convivência da comunidade de plantas daninhas com a cultura da batata pode reduzir a produção de tubérculos em cerca de 6,4 a 65% (Jaiswal, 1992;Beltrano & Caldiz, 1993;Muhammad, 1993;Liebman et al, 1996;Ciuberkis et al, 2007). Vangessel & Renner (1990) ressaltam que a interferência das plantas daninhas na cultura da batata pode influenciar a qualidade dos tubérculos, tornando-os menores e alterando sua densidade, além de causar deformações, diminuindo o seu valor de mercado.…”

“…Para implementação de programas de manejo integrado de plantas daninhas, é imprescindível estudar os períodos de convivência possível entre as plantas invasoras e a planta cultivada, além de requerer apurado conhecimento na predição da emergência das sementes e do impacto das plantas daninhas sobre a cultura (Ciuberkis et al, 2007).…”

Weed community composition in different agro-systems

“…properly (Ciuberkis et al, 2007). In a study over a period of six years, the weed population dynamics in corn crop was affected by tillage systems (no tillage and conventional tillage with ploughing and harrowing) and by herbicide application and mowing (Correa et al, 2011).…”