Yield and nutrient uptake by winter sunflower (Helianthus annuus) as influenced by nitrogen and phosphorus
Year: 2001
Type: article
Abstract: A field experiment was conducted during up to 60 kgha (Table 1). Similar effect of N the winter season of 199 1-92 to study the levels was observed on uptake of N, P and effect of nitrogen and phosphorus K. Application of ,60 kg Nha had fertilization on sunflower (Helianthus significant ~eed-~ield advantage of 24 and annuus L.) at Bhubaneshwar. The soil was 8.5% over 20 and 40 kg Nlha respectively. sandy loam, having total nitrogen 0.03%, The stover yield and the harvest index available phosphorus 16.5 kglha, available showed the similar response to N levels. potassium 155.5 kgha and organic carbon Higher seed and stover yields and the 0.368%, with pH 5.7. The experiment harvest index might be due to more uptake consisting of 3 levels of nitrogen (20,40 and of N, P and K. 60 kgha) and 3 levels of phosphorus (20,40 Application of P significantly increased and 60 kgha) and the control with no N and the dry-matter yieldlplant, seed yield, stover P was laid out in randomized complete- yield and N, P and K uptake. The response block design replicated 3 times. Variety was very good up to 60 kg P20,ha. The seed Morden was used as a test crop. The crop yield obtained at 60 kg P20,iha was 8.5 and was sown on 1 December 1991. A uniform dose of 30 kg 6 O h a along with half dose 3% more than that of 20 and 40 kg P,O,ha of N and full dose of P20, as per treatment respectively. The response was higher up to was applied at sowing and the rest half dose 20 kg than the subsequent higher levels of of was top-dressed at 25 days after PiO,. The P application did not influence sowing. Two irrigations were applied at the harvest index of sunflower, but signifi- bud-devklopment and flowering stages of cantly increased the oil yield. This might be the crop. due to abundance of P in seeds which stimu- Dry-matter accumulation increased lated the formation of filled compact seeds significantly with an increase in level of N and increase in seed number.
Source: Indian Journal of Agronomy
Authors: A. MISHRA, P. DASH, R. K. PAIKARAY
Institution: Odisha University of Agriculture and Technology
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
OpenAlex ID: W4390290199