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lpmorenoc / dssat-csm-os

DSSAT Cropping System Model
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Review high values of LAI at the end of the growing season #44

Closed lpmorenoc closed 3 years ago

lpmorenoc commented 3 years ago

This is mainly for branching varieties and I assume it the the result of overestimating the number of apices in the plant. image

lpmorenoc commented 3 years ago

This is the current leaf number curve: image If I define leaf appearance as 0 after 300 days after emergence, the LAI is reduced as in the observed data: image However, it does not reflect the actual leaf appearance in the crop: image

lpmorenoc commented 3 years ago

Apparently there are two picks for leaf size increase due to the release of water stress: image If we remove the increase on leaf area we get: image

This still capture the reduction of storage root weight for some varieties: image

The individual leaf size is:

image

The main issues is the total leaf area by cohort when the plant has branched: image image

Although at the end of the growing season the individual leaf is less than 100 cm2 (AREA2), the number of apices are 25 (# apices) producing an area by cohort of more than 2000 cm2 (AREAT):

BRNUM LNUM AREAP AREA1 AREA2 AREAT AREAS WFLF NFLF AFLF TFGLF TFDLF LLIFG LLIFA LLIFS LLIFE DAP DAP_gen # apices
3 21 106.2 96 96 1607 0 0.24 0.07 0.07 0.1 0.4 8 30 0 38 360 322 16.73958
3 22 105 97.4 97.4 1630 0 0.17 0.01 0.01 0.07 0.4 8 28 0 36 360 324 16.73511
4 1 103.4 90.72 90.72 2278 0 0.14 0.03 0.03 0.12 0.44 8 25 0 33 360 327 25.11023
4 2 101.6 94.03 94.03 2361 0 0.1 0 0 0.07 0.41 8 22 0 30 360 330 25.10901
4 3 99.89 94.88 94.88 2383 0 0.11 0 0 0.05 0.39 8 19 0 27 360 333 25.11594
4 4 98.76 97.6 97.6 2451 0 0.11 0 0 0.01 0.36 8 17 0 25 360 335 25.1127
4 5 96.96 89.64 89.64 2251 0 0.23 0.06 0.06 0.08 0.39 7 15 0 22 360 338 25.11156
4 6 95.35 89.45 89.45 2246 0 0.27 0.05 0.05 0.06 0.35 7 12 0 19 360 341 25.109
4 7 94.42 79.32 79.32 1992 0 0.35 0.16 0.16 0.16 0.41 6 11 0 17 360 343 25.11346
4 8 92.98 89.26 89.26 2241 0 0.24 0.04 0.04 0.04 0.34 7 7 0 14 360 346 25.10643
4 9 91.86 77.16 77.16 1938 0 0.35 0.16 0.16 0.16 0.41 6 5 0 11 360 349 25.11664
4 10 90.85 76.31 76.31 1916 0 0.43 0.16 0.16 0.16 0.4 6 3 0 9 360 351 25.10811
4 11 89.51 64.44 64.44 1618 0 0.6 0.28 0.28 0.28 0.47 6 0 0 6 360 354 25.10863
4 12 88.45 31.84 31.84 799.6 0 0.65 0.28 0.28 0.28 0.74 3 0 0 3 360 357 25.11307
lpmorenoc commented 3 years ago

Reducing the individual leaf size after 900 GDD: image

Reduces the leaf area by cohort but still not enough to avoid the increase on leaf area: image image