Post-Anthesis Nitrogen Dynamic Models and Characteristics of Rice Combined with Sowing Date and Nitrogen Application Rate
نویسندگان
چکیده
In order to explore the effect of relationship between combination sowing date and nitrogen application rate on status rice plants uptake transfer after anthesis, three dates were set—23 May (S1), 2 June (S2), 12 (S3)—and four fertilizer treatments—no (N0), 180 (N1), 270 (N2), 360 (N3) kg N/hm2—were applied in a field experiment. The dynamic characteristics post-anthesis under different treatments analyzed by model fitting. results showed that three-leaf SPAD values varied, exhibiting slow–fast–slow inverted S-shaped curve days anthesis. However, maximum value (ks), time enter rapid period decline (t1s), reach (Ts) treatments. (ks) each increased with increase application; t1s treatment was 15–29 spike development, S3 entered earliest. It beneficial leaf grain, content, dry matter, stem sheaths varied anthesis; exhibited highest values. Leaf content matter decreased linearly treatments, an exponential downward trend. parameters alnc, aldm, alnu, blnc, bldm, blnu all gradually delay nitrogen, obtained S3N3 treatment. accumulation treated grains upward trend over time; (kgdm) greatest at 9652.7 kg/hm2, duration grouting (t2gdm ? t1gdm) longest, lasting 32 days. absorption (kgnu) treatment, whereas (t2gnu t1gnu) longest S1N0. These provide basis for development optimized application, real-time management, distribution models dates.
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ژورنال
عنوان ژورنال: Sustainability
سال: 2022
ISSN: ['2071-1050']
DOI: https://doi.org/10.3390/su14094956