In 1918 Pólya formulated the following problem: “How thick must the trunks of the trees in a regularly spaced circular orchard grow if they are to block completely the view from the center?”(Pólya and Szegő [2]). We study a more general orchard model, namely any domain that is compact and convex, and find an expression for the minimal radius of the trees. As examples, solutions for rhombus-shap...

The physiological and psychological relaxation effects of viewing a kiwifruit (Actinidia deliciosa 'Hayward') orchard landscape were investigated. Seventeen Japanese adult females (46.1 ± 8.2 years) viewed a kiwifruit orchard landscape or a building site (control) for 10 min. The heart rate variability and heart rate were determined. The modified semantic differential method and the short-form ...

We describe a natural way to plant cherryand plumtrees at prescribed generic locations in an orchard.

We describe and prove uniqueness of a natural homomorphism (called the Orchard morphism) between some groups associated to finite sets.

Bees are important pollinators of agricultural crops, and bee diversity has been shown to be closely associated with pollination, a valuable ecosystem service. Higher functional diversity and species richness of bees have been shown to lead to higher crop yield. Bees simultaneously represent a mega-diverse taxon that is extremely challenging to sample thoroughly and an important group to unders...

s: Lead-arsenate was used to control codling moth (Cydia pomonella) in apple (Malus sylvestris Mill) orchards from the 1900’s to the1960’s. Lead and arsenic are generally immobile and remain in the surface soil. Some orchard lands are being used for vegetable crop production. There are concerns of lead and arsenic accumulation in vegetables crops grown in these soils. Objectives were to 1) dete...

1 Metrica Corporation 1012 Hercules, Houston TX 77058 U.S.A. 2 Rehabilitation Engineering Program Depts. of Physical Medicine and Rehabilitation and Biomedical Engineering University of Michigan, Ann Arbor, MI 48109 U.S.A. 3 Amerigon Corporation 5462 Irwindale Avenue, Irwindale, CA 91706 U.S.A. 4 PhaseMedix Consulting 24380 Orchard Lake Road, Suite 114 Farmington Hills, MI 48336 U.S.A. 5 Depart...

Robotics and intelligent sensing systems can provide useful information to improve yield and quality in specialty crop production. A key requirement for treecrop applications is the ability to associate sensed data to the individual trees in an orchard. A mobile ground robot with a scanning lidar (laser range sensor) is used to build a three dimensional (3D) model of an orchard and algorithms a...

Orientational responses of four species of feral tortricid moths (Lepidoptera: Tortricidae) to polyethylene tube dispensers of pheromone were observed in a 0.8 ha apple orchard treated with such pheromone dispensers and in an untreated 0.8 ha orchard. Male oblique-banded leafrollers, Choristoneura rosaceana (Walker) (mean 7.2 ± 0.4 moths/night during 21 nights) , Oriental fruit moths, Grapholit...