Effect of drought stress, nitrogen resources and plant density on some agro-physiological traits of Sunflower (Haysan variety) in the north of Golestan province

Subject Areas : Crop Production Research

serajodin moezi ¹ , mohamadreza dadasi ² , hosein ajamnorozi ³

1 - دانشجوی دکتری زراعت، واحد گرگان، دانشگاه آزاد اسلامی، گرگان، ایران
2 - استادیار گروه زراعت و اصلاح نباتات، واحد گرگان، دانشگاه آزاد اسلامی، گرگان، ایران
3 - استادیار گروه زراعت و اصلاح نباتات، واحد گرگان، دانشگاه آزاد اسلامی، گرگان، ایران

Received: 2019-11-28 Accepted : 2020-04-23 Published : 2020-05-30

Keywords: Drought stress, nitrogen, Sunflower, Plant density, Agro-physiological characteristics, Hissan cultivar,

Abstract :

 The present study was carried out to investigate the effect of drought stress, nitrogenresources and plant density on some agro-physiological traits of Sunflower (Haysanvariety) in the north of Golestan province. This experiment was done as split plot factorialbased on completely randomized design with 3 replication for two consecutive years and27 treatments in 2017 and 2017. Irrigation factor in 3 levels: S1: rainfed, S2: one plantingirrigation stage, S3: three irrigation (planting, flowering and seed filling) as main factorand nitrogen fertilizer resources in 3 levels: N1: 100% urea, N2: 50% urea and 50%nitroxin, N3: 100% nitroxin and plant density in 3 levels: D1: 50000 plants per hectare,D2: 75000 plants per hectare, D3: 100000 plants per hectare were considered as subfactor. The results showed that the highest mean of CGR was obtained in the S3N2 andN3D3 treatments with an average of 26.041 and 22.0300 g/m2, respectively. The highestplant height with values of 155.75 cm and 1252.89 cm was related to S3N2 and S3D3treatments, respectively. The highest number of seeds per inflorescence belonged to S3N2(285.68) the maximum 1000 seed weight with 29.27 g and 26.69 g were gained in S3D3and N1D1 treatments. According to findings, the highest economic yield (192.88 kg/ha )was conducted in irrigation at 3 stages, 50% urea fertilizer consumption + 50% nitroxinand 100,000 plant density per hectare.