Estimating Maize Ear Grain Yields on Farm

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.

Flowering, Yield and Yield Components of Sorghum as Affected by Application Timing of Nitrogen and Levels of Zeolite

“…Table 3 showed that asignificant increase of timing application by application timing of nitrogen at the half at the stage of 4 leaves + half at the beginning of the boot stage (N2), gave the highest average (3644 grain head -1 ), while the addition treatment at the half at the stage of 4 leaves + half at the stage of 50 % flowering(N3) gave the lowest average(3255 grain head -1 ). The reason may be attributed to this treatment had the shortest number of days from sowing until the 50% flowering stage ( Table 2) and increased efficiency of the source when adding nitrogen at this stage, thus positively reflected in increasing of the fertilization process and pollen vitality, which increased the number of grains, agreed with [15]. The results also showed that zeolite levels affected this trait , as the 32 t h -1 (Z2) gave the highest average (3587 grain head -1 ), while the comparison treatment gave the lowest average (3364 grain head 32 t h -1 ).…”

Response of Maize Genotypes to Combinations of Nitrogen and Humic Acid Fertilization

“…This is confirmed by [43] mentioned that the genotypes responded to the change in nitrogen fertilizer levels significantly and achieved the best significant interaction through the three way cross IPA3001 with high levels of nitrogen. The grain yield is the most important field measure for the cultivar, as it reflects the final outcome of the vital activities carried out by the plant, which are mainly related to the genetic factor and its interaction with the available growth factors [45].…”

Effect of Glutamine and Proline Spraying on Yield and Quality of Soft Wheat (Triticum aestivum L.) Genotypes

“…Table (1) displays the results of a study on the impact of glutamine and proline on wheat productivity and quality, which was done in 2022-2023 in the Al-Batira area, 20 kilometers from the city center.…”

“…About a third of the world's population uses it as their main food supply. The most important source of carbohydrates in most cultures, it also provides vitamins, fats, certain mineral salts, and essential amino acids [1]. The goal of increasing production led to a rise in the area under cultivation for this crop in Iraq, which in 2020 reached roughly 2143 hectares and yielded 6.3 million tons.…”