Weed Dynamics and Nutrient Uptake of Maize as Influenced by Different Weed Management Practices

Abstract

Background: Maize (Zea mays L.) is the most versatile and emerging food crop of global importance. Weeds are ubiquitous but their presence in wide spaced and initially slow growing crop like maize acts as an obstacle for plentiful harvest. Nutrient uptake by weeds during the first thirty days of maize growth was 59 kg N, 10 kg P2O5 and 59 kg K2O per ha, which was 7-10 times higher than the nutrient uptake by maize.Methods: The present field experiment was conducted during Rabi, 2018-19 under irrigated conditions at wetland farm of S.V. Agricultural College, Tirupati andhra Pradesh, with ten treatments and three replications in a randomized block design.Result: Lower density and dry weight of weeds with higher weed control efficiency, lower nutrient uptake by weeds and higher nutrient up take by maize at 80 DAS, kernel and stover yield was recorded with hand weeding twice at 15 and 30 DAS, which was statistically at par with atrazine 1.0 kg ha-1 as PE fb topramezone 30 g ha-1 or tembotrione 120 g ha-1 as PoE or atrazine 1.0 kg ha-1 as PE fb HW at 30 DAS, while these were lowest with weedy check. Higher benefit cost ratio of maize was noticed with both atrazine 1.0 kg ha-1 as PE fb topramezone 30 g ha-1 as PoE (T3), which was in parity with atrazine 1.0 kg ha-1 as PE fb tembotrione 120 g ha-1 as PoE (T2) and hand weeding twice at 15 and 30 DAS (T9). From the present study it may be concluded that atrazine 1.0 kg ha-1 as PE fb topramezone 30 g ha-1 or tembotrione 120 g ha-1 as PoE were considered to be the most effective and economic weed management practices to increase the productivity of Rabi maize at times of labour scarcity.

Role of Integrated Nutrient Management on Soil Fertility Improvement and Selected Crop Production in Ethiopia: Review Study

“…The findings of the current research are in agreement with those of [37]. The plot treated by vermicompost or FYM in addition to chemical fertilizers exhibited higher nitrogen absorption levels than the control [56,54]. The intercropping patterns had a significant influence on the N absorption by maize and soybean, and they were positively correlated with soil mineral Nitrogen at both sites during the survey [42].…”

Assessment of Macro and Micro Nutrients of Soil in Rice (Oryza sativa L.) Fields in Onattukara Wetlands Regions, Kerala

“…Phosphorus levels in soil should be between 22.5 and 56 kilogrammes per hectare (kg ha -1 ) Gupta et al (2006). Similar finding was reported Rani et al (2022) Plant growth will be slow and stunted if there is a phosphorus shortfall, but an overabundance of phosphorus will have no direct effect on the plant but may cause visible deficiencies of Zn, Fe and Mn. Potassium values ranged from 22.28 to 419.21 kg ha -1 (average: 130.2 kg ha -1 ) (Table 3).…”