مقاله Chlorophyll meter – a decision-making tool for nitrogen application in wheat under light soils

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توجه : در صورت  مشاهده  بهم ریختگی احتمالی در متون زیر ،دلیل ان کپی کردن این مطالب از داخل فایل ورد می باشد و در فایل اصلی مقاله Chlorophyll meter – a decision-making tool for nitrogen application in wheat under light soils،به هیچ وجه بهم ریختگی وجود ندارد

بخشی از متن مقاله Chlorophyll meter – a decision-making tool for nitrogen application in wheat under light soils :

سال انتشار : ۲۰۱۶

تعداد صفحات :۲۴

Nitrogen (N) in plants is generally diagnosed by a soil test and plant tissue analysis.However, such analyses are costly in terms of time and money and are not easily accessible byresearchers and extension workers, let alone farmers. Alternative cost-effective methods arerequired for rapid analysis of the N status of crops and to guide N management in wheat. Theobjective of this study was to assess whether the SPAD values using a leaf chlorophyll metercould be used to apply N at the maximum tillering (MT) stage of irrigated spring wheat grownunder light soils of South Asia. Experiments were conducted over two years under light soils atthe Wheat Research Centre (WRC), Dinajpur, Bangladesh. Treatments were 80, 100 and 120kg N ha−1, applied two-thirds as basal and one-third at the crown root initiation (CRI) stagealong with additional 10, 20 and 30 kg N ha−1 (first year) and 0, 10, 20 and 30 kg N ha-1 (secondyear) at MT. Rates at MT were determined on the basis of SPAD values, which fell below thecritical value of 37.5, recorded at 45 days after sowing (DAS). SPAD values recorded at 55 and65 DAS were positively correlated with grain yield (GY), indicating that the application of extraN at MT influences wheat GY. Our results have two major implications: (i) SPAD values basedon a leaf chlorophyll meter can be used for N application and (ii) extra 30 kg N ha-1 at MT isrecommended for achieving maximum GY of irrigated spring wheat under the light soils ofSouth Asia.