Abstract
Crop growth modelling is one of the important sciences in field crop sciences for it helps to reduce time and effort in searching for a fact or result. This article was dealed with a formula to predict maize ear grain weight when plants still standing on farm. Two genotypes of maize were used in this trial, a hybrid of feed maize was used in 2018 and an open-pollinated cultivar of pop corn in 2019. Ear length and diameter were measured on 50 randomly taken plants of full seed – set before harvest .Ears were harvested later, air dried ,threshed and weighed, then yield adjusted to 15% moisture .Ears were considered as cylinder ,and volumes of each ear were calculated .Date of observed ear grain weights and their volumes were analyzed for their correlation and regression ,they were fit in both years .The expected ear grain weight in 2018 formula was: expected dry ear grain weight (g) = - 0.1342 + 0.4871 ear volume (cm3) and in 2019 , the formula was : expected dry ear grain weight(g) = +0.3509 + 0.4776 ear volume (cm3). Date of observed and expected dry ear grain weights was analyzed by t- test. The results showed high similarity between observed and expected ear weights, indicating that these two equations will be helpful to estimate dry ear grain weight of maize, while plants still on farm.
Highlights
Crop growth modelling is a very helpful science to understand and / or estimate some parameters in crop growth and yield
Previous results were found by measuring sunflower diameter to estimate plant seed yield, for the highly significant correlation between sunflower capitulum area and seed yield [4, 8, 12, 13, 16, 19]
Some recent researchers worked on maize, Al-Khafajy et al [2] estimated grain yield of F2 plants of hybrids by using a formula depending on parental yield averages and F1 grain yield average, without a need to grow F2 seeds
Summary
Crop growth modelling is a very helpful science to understand and / or estimate some parameters in crop growth and yield. ًتقدير حاصل حبوب عرنوص الذرة الصف ارء حقليا كان هدف هذا البحث وضع معادلة يمكن بواسطتها تقدير حاصل حبوب عرنوص الذرة الصف ارء في الحقل بغض النظر عن للسنة الثانية مما يؤكد إمكانية اعتماد هاتين المعادلتين لتقدير حاصل الذرة الصف ارء وهي لا ازلت قائمة في الحقل بالاعتماد على
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