Influence of nitrogen and herbicide treatments on the nitrogen uptake of pea and Chenopodium album L.

Abstract

Based on the results of earlier greenhouse tests, a field experiment was conducted to evaluate the effects of three different herbicide combinations (clomazone, flumioxazine and pendimethaline combined with bentazone) at increasing nitrogen levels on the nitrogen uptake of green pea and common lambsquarters ( Chenopodium album L.). Nitrogen was administered to the pea plants in the form of ammonium nitrate at increasing levels: 0, 100, 200 and 300 kg/ha. The experimental soil was loamy Ramann’s brown forest soil (Eutric Cambisol). Green peas were grown to green maturity and harvested according to standard agricultural practices. Following harvest, the fresh and dry weight of the pea and weed shoots were recorded. The nitrogen, phosphorus and potassium contents were determined from dried plant samples after digestion with concentrated sulphuric acid.The main results can be summarized as followsThe addition of nitrogen to the treatments considerably altered the growing potential of pea plants, especially at the early growth stage, where an increase in dry biomass of nearly 30% was observed. Yield biomass decreased in the nitrogen treatments. The nitrogen concentration, which increased in every treatment, was directly correlated to the addition of nitrogen fertilizer. Herbicides mainly influenced the vegetative growth of the plants. Pendimethalin and flumioxazin indirectly caused an increase in the dry biomass of the shoots by killing the surrounding weeds.

Evaluation of efficacy of different herbicides on weed dynamics and performance of dwarf fieldpea in Tarai soils of Uttarakhand, India

“…Different treatments were not able to cause significant difference on 1000 grain weight. Remarkable improvement in yield and yield attributes of pea due to different weed control treatments over weedy check were also reported by Wagner and Nadasy (2010).…”

Response of fieldpea (<italic>Pisum sativum</italic> L. var arvense) to various planting methods, irrigation schedule and weed management practices

“…One hand weeding at 25 DAS recorded significantly more dry matter/plant than pendimethalin 1.0 kg a.i./ha (Table 1). More number of branches under this treatment might be due to less weed density, which provided sufficient space for horizontal spread of crop and led to higher dry matter accumulation per plant (Singh and Tripathi, 2004;Wagner and Nadasy, 2010). Dry matter accumulation per plant is an ultimate result of all the metabolic processes occurring inside the plant.…”