The ancestry of date palm is reviewed with reference to the complex relationship existing between date palm (Phoenix dactylifera) and sugar date palm (P. sylvestris) during early introduction of the date palm into India, especially in Kutch, Gujarat. The cultivation practices of growing the date palm in important regions of India are described. Because of climatic limitations, it is impossible to fully ripen fruits on the trees; therefore, harvest is done at khalal stage with subsequent artificial ripening. The common varieties preferred for cultivation and their performance are reviewed. The institutions involved in activities of introducing imported cultivars and developing tissue culture plants from local varieties are detailed. Introductions of elite foreign cultivars have been successful, especially with respect of Barheecv. Studies are underway to assess the germplasm value of seedling date palms, and to establish tissue culture laboratories to propagate local varieties and imported cultivars. Because India is the world's largest importer of dates, local production has strong potential to supply domestic markets and to create jobs in the dry areas of the northwest. Problems facing the cultivation of date palm in India are pointed out.
The deficiency of nitrogen (N) in soil restricts agricultural productivity and its overdosage pollutes the atmosphere. Nitrogen is a vital component of protein, chlorophyll and various physiological processes. When it is applied at a recommended dose, it may be lost through fixation, leaching, volatilization and denitrification, etc. Therefore, there is a dire need to harmonize the supply of nitrogen according to crop and soil requirements. Under this situation, precision nitrogen management is one of the best options. GreenSeekerTM is an integrated optical sensor with a variable application rate and mapping system that measures crops’ nitrogen requirements. To ascertain the abovementioned facts, a research study was conducted at the National Agriculture Research Center, Islamabad, Pakistan, to examine the response of fodder oat to nitrogen management (N0 = control, N1 = 80 kg ha−1 basal dose, N2 = 40 + 40 kg ha−1 split doses, N3 = 40 kg ha−1 with one-time management with GreenSeekerTM and N4 = 20 kg ha−1 with two-time management with GreenSeekerTM) and seed rate (S1 = 80, S2 = 100, S3 = 120 and S4 = 140 kg ha−1). Data were recorded on the agronomic and physiological aspects of the crop and economic analysis was performed for GreenSeekerTM-based N application against the conventional recommended dose of nitrogen application. Mean values showed that greater number of tillers plant−1 (6), fresh weight (16572 kg) and photosynthetic rate (11.64 mmol m−2 s−1) were noted in the treatment N4 (20 kg ha−1 and two-time management with GreenSeekerTM). Greater plant height (70.8 cm) and leaf area (64.14 cm2) were recorded in treatment N2 (40 + 40 kg ha−1 split doses) as compared to the control. The effects of nitrogen on fodder oat were forecasted through NDVI. The results suggested that nitrogen treatment N4 (18 kg ha−1) managed by GreenSeeker in the PARC Oat cultivar produced the maximum NDVI value (0.68) at the booting stage among all treatments. The correlation of NDVI at the tillering and booting stages with green fodder yield was positive (R2 = 0.80). Therefore, the tillering and booting stages can be good depictive stages at early and later growth stages of fodder oat under the agro-climatic conditions of Islamabad, Pakistan. Based on the results, it is recommended to apply an initial dose of 20 kg ha−1 nitrogen along with two-time management with GreenSeekerTM for obtaining more green fodder yield in fodder oat. In Crux, with N1, a total of 80 kg ha−1 nitrogen was applied to achieve an estimated net profitability of USD 582.13. With N4, a total 58 kg ha−1 nitrogen was used to achieve a net profitability of USD 836.16; therefore, this treatment was found to be environmentally safe as compared to N1 (80 kg ha−1).
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